Unit 6 TV programmes 知识点讲解+精选精练 2023-2024学年牛津译林版英语九年级上册

Unit 6 TV programmes 知识点讲解 精选精练 2023-2024学年牛津译林版英语九年级上册 语法知识点讲解 1. if if可以用来引导条件状语从句，此时，if通常表示“假如”。if引导的从句既可以放在主句之前也可以放在主句之后。当从句位于主句之前时，常用逗号与主句隔开。当一个句子中含有if引导的条件状语从句时，主、从句的时态有如下情形： ★如果从句表示将来要发生的事情，从句通常用一般现在时，主句用一般将来时，即遵循“主将从现”原则。例如： If it doesn’t rain, I will go for a picnic. ★如果主句中含有will、may、can、might等情态动词时，从句通常用一般现在时。例如： You can go if you want. ★如果表示的是客观事实或普遍真理，从句和主句通常都用一般现在时。例如： If you heat ice, it melts. ★如果主句是祈使句，从句通常用一般现在时。例如： Don’t play computer games if you don’t finish your homework. 2. unless unless意为“除非，如果不”，可用来引导条件状语从句。unless引导的从句既可以放在主句之前也可以放在主句之后。当从句位于主句之前时，常用逗号与主句隔开。unless引导的从句可用if ... not ...改写且句意保持不变。此外，如果主句是一般将来时态，则unless引导的从句的时态通常用一般现在时表将来。例如： Unless you know the way to the mountain, you’d better take a map. =You’d better take a map unless you know the way to the mountain. Unless you agree, I won’t read your diary. =I won’t read your diary unless you agree. I sleep with the window open unless it’s cold. =I sleep with the window open if it is not cold. I have to go there for myself unless you can take the place of me. =I have to go there for myself if you can’t take the place of me. 精选精练 一、用所给单词的正确形式填空 1．Don’t (waste) time. You should work hard at your lessons. 2．—Mum, could I play football with my friends this afternoon? —Of course, if your homework (finish). 3．In that film a nurse was found （die）in her house. 4．Children should not be allowed to watch movies. （violently） 5．The magazine has picked out some events that happened last year and (influence) our world for years to come. 6．Tom always makes more mistakes than his brother. He is (silly) of the two. 7．Great changes have taken place in some (Asia) countries. 8．Are you looking forward to the （come） school sports meeting？ 9．If we don’t work hard today, we （live）to be sorry about our laziness in old age. 10．On 30 December, 2021, Zhang Xiaofei won the 34th Golden Rooster Award for Best for her r