英语中条件句条件句1.I f you don’t hear from me by next Friday,you__(a

英语中条件句
条件句
1.I f you don’t hear from me by next Friday,you__(assume)I’m not coming.我填will assume,可答案是can assume
2.I will let you into the secret only if you ______(promise)not to tell anyone else.答案为什么是will promise
3.Look up the answer in the key only if it___(be)really impossible for you to work it out yourself.怎么是is
4.If she ____(promise)to be here ,she will certainly come .答案是has promised.句型里没有完成式的吧
5．If he _(say)that ,he must be a fool.为什么不是say ,是said
6.How would you react if a stranger _______(ask)how old you are?为什么是asked,而是were to ask
7.I f he _(lift)a finger to help me ,I would be sure of success.if 后面怎么会是would lift.我觉得就是left.