if条件状语从句和宾语从句(共16张PPT)

Adverbial Clause of Condition if 引导的条件状语从句&宾语从句 She is doing her homework. If you are hard-working, you will get good grades. She gets good grades. If you play computer games on weekdays , you’ll be very tired in class your parents will be sad. you won’t get good grades. your eyes will be poor 1) 条件状语从句通常由if或unless(=if not)引导，从句中常用一般时代替将来时，即if或unless后的句子谓语用一般现在时。但是，主句则通常用将来时，情态动词或祈使句。 时态－－主将从现 主句一般将来时， 从句一般现在时 1. 如果主句是一般将来时，从句则用一般现在时。 If it rains（从句）， I will stay at home. I’ll go with you if you don’t want to go alone（从句）. 2.如果主句含有must, may, can 等情态动词，从句也要用 一般现在时。 If you drive too fast, you may have an accident. You must stop if the traffic light is red. 3. 如果主句是祈使句，从句同样要用一般现在时。 Don’t go and play football if you don’t finish your homework. Please call me if he comes next Sunday. if条件状语从句结构及时态 Revision If 引导条状语从句时，从句中用一般现在时代替一般将来时。 1. If he ______(go) to the movies,he won’t finish his w