Question

Our teacher always tell us ________ more English in and out of class.

1. A.
   speak
2. B.
   spoken
3. C.
   to speak
4. D.
   speaking

Answer 1

C
tell后接不定式做宾语补足语，tell sb. to do sth.告诉某人做某事。
◆在“形容词/副词+enough+不定式”结构中表“足以能…”，如：He is strong enough to do the work．
◆复合结构不定式(for sb. to do sth.)，可做主语、表语、宾语、定语和状语。for本身无意义，sb.可称之为不定式的逻辑主语。如：I think it necessary for him to go there at once.（复合结构不定式做宾语）
注意：当作表语用的形容词表示不定式的逻辑主语的性质或特征时，不用for，而用of。
如：It is kind of you to help me.（相当于You are kind to help me.）这类形容词有good, nice, kind, wise, clever, foolish, silly, stupid, careless, impolite（不礼貌）等。right, wrong既可用于for sb. to do sth.，也可用于of sb. to do sth.如：It's right / wrongg for him to do the work alone.