Todo called infinitive, can act as a variety of ingredients, it does not have a fixed form, belongs to the "universal substitute."
[To repair bicycles] is his job.
"It's his job to fix the bike."
The subject is put back:
It is his job [to repair bicycles].
It is a formal subject, and to does is the real subject.
When Todo a subject, put it at the top of the sentence or at the end of the sentence.
It must be terrible [to is grown up].
"It's really bad to grow up."
To being grown up is the real subject and it is the form subject.
To do is the subject of common sentencesIt is easier for the detective [to watch her].
#句型1 It is adj. (+for sb.) + Todo sth.
"Something is xxxx for someone".
It is important for us [to study 中文版].
Pay attention to the middle for SB. can be omitted:
It is happy [to get together sometime].
#句型2 It takes (+SB.) + some time + todo sth.
It takes sb. A long time to do sth.
Note: Take can change tenses.
Non-predicate verb to do which language (after transitive verb)It took me ten minutes [to persuade her]. It'll take six weeks [to decorate].
All of the students want [to pass exams].
Want to do something this is a fixed phrase collocation
Want verb, to do is its object.
He began [to play a tune].
Begin to do something and fix it. You can also use the begin doing. Non-predicate verb to do as predicative (after verb)
My dream are [to travel around the world].
is System verb