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if?

[误] If it will rain I won't go to school tomorrow.?

[正] If it rains I won't go to school tomorrow.?

[析] 由if引起的状语从句要用一般时表示将来。?

[误] I want to know if he comes here tomorrow.?

[正] I want to know if he will come here tomorrow.?

[析] if所引起的如果是宾语从句则不能用一般现在时表示将来。?

[误] I want to know if it will rain tomorrow he will come or not.?

[正] I want to know if it rains tomorrow he will come or not.?

[析] 这里的if从句是整个宾语从句的条件状语，所以，还应用一般时表示将来。?

ill ?

[误] He spent many years looking after his ill father.?

[正] He spent many years looking after his sick father.?

[析] ill和sick都可以作表语，如： I'm ill (sick). 美国英语中常用sick， 而英国英语中两者都可用，但ill一般不作定语。?

in ?

[误] In a cold morning, I went to school alone.?

[正] On a cold morning, I went to school alone.?

[析] 在in the morning或in the afternoon词组中，不论在这两个名词的前或后加任何修饰词，其介词in都要变为on.?

[误] I will finish it after two days.?

[正] I will finish it in two days.?

[析] 中文中几天以后可以完成，或几天后来取，在译为英文时都不要用after，而要用in.如： He will be back in a few days.?

in into ?

作为副词应用in，而不能用into，如： Come in, please. 又若在句中不涉及到动词的位置，只是表达空间的位置时用in，如： The teacher in the office is my mother. 但在go, run, come, walk, dive等词后则要用into. 如： She dives into the river.?

instead ?

[误] The boy stayed in bed all day instead to go to school.?

[正] The boy stayed in bed all day instead of going to school.?

[析] instead of其后要接动名词、名词或代词，而不能用不定式，如： I choose this book instead of that one.?

[误] The beer here is not good, so I drink wine instead of it.?

[正] The beer here is not good, so I drink wine instead.?

[析] instead是副词，而instead of是介词短语。如： If you are not free, you may come another day instead.?