Question

Why not________on the heater since it's so cold here？

1. A.
   you turn
2. B.
   to turn
3. C.
   turning
4. D.
   turn

Answer 1

D
分析：提出“建議”的句型why not意思是“干嗎不”，why not后面的動詞用不帶to的動詞不定式形式。(延伸)Why not do sth？是“建議”句型，因此不能用because來作反應。應該說That's a good idea．對過去的事情是不可能發出“建議”的。下面是錯句：Why not turn on the heater yesterday？應該改為Why didn't you turn on the heater yesterday？此時要用because來回答問題。(延伸)Why not do sth？(對雙方或對對方發出建議)來源于Why don't we do sth？(對雙方發出建議)或Why don't you do sth？(對對方發出建議)