to do：

it形式主语It is/was adj./n. (for sb./of sb.) to do sth.

it形式宾语find/think/feel/consider/make it adj./n. (for sb.) to do sth.

used to do sth.过去常常做某事；warn sb. not to do sth.警告某人不要做某事；

have no choice but to do sth.别无选择只能做某事；only to do/to be done结果却/却被...；

sb./sth. be said/reported to do据说/据报道某人/某事...

do：

have/make/let sb. do sth.让某人做某事；had better (not) do sth.最好(不)做某事；

would rather do A than do B/ would do A rather than do B宁愿做A而不愿做B；

doing：

be/get accustomed to doing sth.=be/get used to doing sth.习惯于做某事；need doing需要被做；

be worth doing值得被做；be busy doing sth.忙于做某事；look forward to doing sth.期待做某事；

have difficulty/trouble/problems (in) doing sth.做某事有困难；

done：

have/make sth. done让某人/某物被...；

make oneself done使某人自己被...