摘要: at all用于否定句加强语气. e.g. He is rather stubborn. I am a little careless. She is a bit absent-minded. He is extremely patient. I am not serious at all. They’re quite friendly. (四)to give reasons and purposes e.g. 1)-Why did you get a pet? -To have company. 2)-Why do they use animals for treatment? -Because they help people relax. 3)-Why do you talk to your parents about everything? -So they trust me. 4)I want a pet to take it for walk. 5)Animals are good listeners because they don’t stop you. To表示目的:Doctors use animals to help people feel better. Because表示原因:I love cats because they are very clean. So表示结果:People have pets so they don’t feel better. (五)to make contrast between two things with different phrases e.g. Eric is hardworking, but Danny is very lazy. While Eric is funny, Danny is quite serious. Danny’s bedroom is very messy. Eric’s, on the other hand, is very tidy. but, while, on the other hand 都表示转折. (六)To talk about personality.

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