介词by的用法1.意为在……旁,靠近。Some are singing and dancing under a big tree。Some are drawing by the lake。有的在大树下唱歌跳舞。有的在湖边画画儿。2.意为不迟于,到……时为止。Your son will be all right by supper time。你...
1. It’s time to go home. 是回家的时候了。 It’s time for school. 是上学的时候了。 2. It’s bad(manners)for you to spit on the ground. 随地吐痰不好。 Smoking is bad for your health. 抽烟不利于你的健康。 To walk is...