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if [误] If it will rain I wont go to school tomorrow. [正] If it rains I wont 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： Im 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. | 
