be used to vs. used to do

I am used to animals.
I used to smoke.

These two expressions look the same, but in fact they are completely different.

be used to

I am used to getting up early.

be used to something
be used to doing something
be used to is an expression. It is not a tense. If I say "I am used to loud noise", it is like saying "I am accustomed to loud noise. It doesn't bother me."

Do not confuse be used to with with the special structure used to do. They have different meanings.

Structure of be used to

The structure of be used to is:

subject

main verb
be

used to

object

More about be used to

used to do

He used to work.

We say used to do when talking about the past. It is not a tense but it is like a tense. It is a special structure. We use the structure used to do for the past only.
If I say "I used to smoke" it is like saying "I smoked in the past but I don't smoke now."

Do not confuse used to do with with the expression be used to. They have different meanings.

Structure of used to do

The structure of used to do is:

subject

main verb
use

to-infinitive

Future Time

The future is uncertain. We know the past. We know the present. We do not know the future. We can be 100% sure or certain about the past and the present. But we can never be 100% certain about the future. In English there are several structures and tenses to talk about the future. It is usually the degree of certainty about the future that decides our choice of structure or tense.
In this lesson we look at four of the most common ways to talk about the future, followed by a summary and then a quiz to check your understanding.

Although we often talk about "future tense", technically there are no future tense in English - only different ways of talking about the future, using special constructions, other tenses or modal verbs.

will

One of the most common ways to talk about the future is with will, for example: I will call you tonight. We often call this the "future simple tense", but technically there are no future tenses in English. In this construction, the word will is a modal auxiliary verb.
Here are the three main ways that we use will to talk about the future.

No plan

We use will when there is no prior plan or decision to do something before we speak. We make the decision at the time of speaking. Look at these examples:

Hold on. I'll get a pen.
We will see what we can do to help you.
Maybe we'll stay in and watch television tonight.

In these examples, we had no firm plan before speaking. The decision was made at the time of speaking.
We often use will with the verb think:

I think I'll go to the gym tomorrow.
I think I'll have a holiday next year.
I don't think I'll buy that car.

Prediction

We often use will to make a prediction about the future. Again, there is no firm plan. We are saying what we think will happen. Here are some examples:

It will rain tomorrow.
People won't go to Jupiter before the 22nd century.
Who do you think will get the job?

be

The verb be is an exception with will. Even when we have a very firm plan, and we are not speaking spontaneously, we can use will with be. Look at these examples:

I will be in London tomorrow.
There will be 50 people at the party.
The meeting will be at 9.30 am.

The verb be is always exceptional!

going to

Intention

We use the special going to construction when we have the intention to do something before we speak. We have already made a decision before speaking. Look at these examples:

I have won $1,000. I am going to buy a new TV.
We're not going to see my mother tomorrow.
When are you going to go on holiday?

In these examples, we had an intention or plan before speaking. The decision was made before we spoke.

Prediction

We often use going to to make a prediction about the future. Our prediction is based on evidence. We are saying what seems sure to happen. Here are some examples:

The sky is very black. It is going to snow.
It's 8.30! You're going to miss the train!
I crashed the company car. My boss isn't going to be very happy!

In these examples, the present situation (black sky/the time/damaged car) gives us a good idea of what is going to happen.

We use will for prediction when we have no real evidence: "It will rain tomorrow." (It's my feeling but I can't be sure.)
We use going to for prediction when there is some real evidence: "It's going to rain." (There's a big, black cloud in the sky and if it doesn't rain I'll be very surprised.)

Present Continuous for Plan

We often use the present continuous tense to talk about the future. Of course, we normally use the present continuous to talk about action happening in the present, but if we add a future word, we can use it to talk about the future. (By "future word" we mean words or expressions like tomorrow, next week, in June. The future word may be clearly expressed or understood from the context.)

Sometimes there is no real difference between an intention (going to) and a plan (present continuous). In this case, it doesn't matter which we use.

We're going to paint the bedroom tomorrow.
We're painting the bedroom tomorrow.

We use the present continuous only when a plan exists before we speak. Look at these examples:

Mary is taking her music exam next year.
They can't play tennis with you tomorrow. They're working.
We're going to the theatre on Friday.

Present Simple for Schedule

When an event is on a schedule or timetable (for example, the take-off time for a plane), we often use the present simple to express the future. We usually also use a future phrase (expressed or understood) like tomorrow, at 6.30pm, next week.
Only a few verbs are used in this way, for example:

be, open, close, begin, start, end, finish, arrive, come, leave, return

Look at these sentences:

The train leaves Detroit at 9pm tonight.
John starts work next week.
Tomorrow is Thursday.

Future Time: Summary

When we speak, we choose the tense that we use. This is important in English, because the tense we choose expresses more than just a simple fact. When we speak about the future, the tense we choose can express how we "see" the future, even our personal feelings about the future. It certainly expresses what we believe to be the probability (the chance, the reality) of something happening or whether we have already decided to do it.

This table gives a simple scale of probability for each structure. It is not exact because language is not a science, and there are many variables. This table should help you to think about the "concept" of the future in English. This concept does not exist in all languages, but it is rather important in English.

% probability (before speaking) of event happening	structure	used for	example
0%	will	no plan	Don't get up. I'll answer the phone.
70%	going to	intention	We're going to watch TV tonight.
90%	present continuous	plan	I'm taking my exam in June.
99.999%	present simple	schedule	My plane takes off at 6.00am tomorrow.

https://www.englishclub.com/grammar/verbs-m_used.htm

https://www.englishclub.com/grammar/verbs-m_future.htm

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