it is n.to do sth.

it is n.to do sth. It is the first ...to do sth. it is worth to do sth. It is a pleasure to do sth. It is times to do sth造句 It is good idea to do sth... It is worthy to do sth. it is+adj+to do sth.意思 It is fun to do sth造句 it is time to do sth过去式 It is fun to do sth.造句. It is possible for sb(sth) to do sth