1.----I don`t know ____Tom will come this afternoon.----I`m

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1.----I don`t know ____Tom will come this afternoon.----I`m sure he won`t.He has后面还有
1.----I don`t know ____Tom will come this afternoon.
----I`m sure he won`t.He has to look after his sick sister at home today.
A.where B.why C.if D.that
2.----Who did the work____,Kate,Lisa or Lucy
----Lucy did
A.carefully B.most carefully C,the more careful D,more carefully
3.I think I`m ____enough to cook by myself,
A.young B.strong C.old D.smart
4.i was ____ at home
A,lonely B.alone
如果可以说理由，请你们尽量说理由|！

1、C,if 是否的意思,我不确定他是否会回来.
2、B,三个人比较,用最高级.
3、C,表示年级大小.我已经够大了,我能自己做饭了.
4、B,alone可作副词或形容词,只作表语,不能作定语；而lonely只能作形容词,在句中充当定语或表语.be alone at home,此处alone用作表语.
再问： if 不是用于肯定句么？为什么在这个句子会用上呢？
再答： if用两种用法，一作“如果、假设”用，引导条件状语从句。二作“是否”讲，与weather可互换，用在定语从句中。

1.----I don`t know ____Tom will come this afternoon.----I`m I don′t know if he come this afternoon 1.I don't know if ________ this afternoon. i don't know who will come I don't know what we will do this afternoon改为同义句 I don′t know if comes back this afternoon 把复合句改成简单句：1.i don't know when i will come back.→i don't know 改错 I don’t know when will they come I don't know if he will come tomorrow. I don‘t know how soon he will come back I don't know when he _(come)back.when he _(come)back,I will I don't know what mean for this question!I don't know what m