Summary of usage

Be used to doing sth. Be used to doing sth. It has not changed in person or quantity.

There are three ways to use it:

1. It means a habitual behavior or state that existed in the past but no longer exists, meaning "used to be", in which the infinitive symbol to is followed by the verb prototype, indicating the comparison between the present and the present. For example:

I used to walk to school, but now I am used to going to school by school bus.

I used to go to school on foot, but now I am used to going to school by school bus.

Used with there be structure to mean "the state that existed in the past", but there is no such state now. For example:

There used to be many trees here. There used to be many trees here. (That is to say, it's gone now)

3. Habit, when used with frequency adverbs, such as always, often and sometimes, does not mean current behavior or current habits, but still means past habits, behaviors that often occur repeatedly in the past or the state of existence. For example:

She used to write to her father with a pen. She used to write to her father with a pen.

Master the customary sentence structure.

The affirmative sentence structure of 1

The subject++is used for++verb prototype ... for example:

I used to go to the movies, but now I have no time. I used to go to the movies, but now I have no time.

2. There were two forms of negative sentence structure in the past.

① The subject++does not use the prototype of the to ++ verb ... This negative sentence mode takes used as the notional verb, so the auxiliary verb did should be used to change the negative sentence, which is the usage of American English. For example:

You used to drink. You didn't use to drink.

(2) Subject++uses not to ++ verb prototype ... This negative sentence takes use as a modal verb, and you can add not directly after use to become a negative sentence. Used not can be abbreviated as used dn' t, which is the usage of British English. For example:

This shop used to open on Sundays. This shop used to be closed on Sundays. ?

3. In the past, there were two forms of general interrogative sentence structure.

(1)do+ subject++use to ++ verb prototype ...? This kind of general question takes used as a notional verb, so the auxiliary verb did should be used when converting general questions, which is the usage of American English. For example:

I often went swimming in the river when I was young.

Did you often go swimming in the river when you were young?

⑵ Use++subject++to++verb prototype ...? This kind of general question takes used as a modal verb, so when it is converted into a general question, it is the idiom of British English to directly mention used at the beginning of the sentence. For example:

He used to go to school by bike. Did he go to school by bike?

4. Get used to the positive and negative answer structure.

When used in ellipsis sentences, the positive type keeps to, and the negative type does not keep to. For example:

Have you ever played basketball? Did you use to play basketball?

Yes, I was. No, I didn't use to call. ) Yes, I often call. No, not often. )

Accustomed to rhetorical question, it has two forms.

(1) In the additional interrogative sentence, it is composed of the auxiliary verb did. This kind of fuzzy question takes used as a notional verb, so the auxiliary verb did should be used when converting fuzzy questions, which is the usage of American English. For example:

She used to go to work by bus, didn't she?

She didn't do it before, did she?

⑵ Use usedn directly in the part of additional questions. This kind of fuzzy question takes used as a modal verb, so it is a common usage in British English to use used directly when converting fuzzy questions. There used to be a bookstore here, didn't there?

6. Usually it can't be used with words indicating time (for example, twice or thrice). ) or a period of time (such as three months, five years, etc.). I have been to Paris three times.

I have been to Paris three times. I have been to Paris three times in the past