3條英文問題

1. preferable bare infinitive
otherwise it might be noun
e.g. we need not try.
we need not you.

2. It is (of) no avail ....
I think of is omitted. "By" cannot be inserted in it.

similar example, It is no use sleeping the whole day long.

2008-02-17 13:34:51 補充：
3. like Q.2, It is important=It is of importance It is of+noun+(that)or you might try inversion, of great importance it was,...