since prep. 自以后；从以来 conj. 因为为；由于；既然 cough n. & v. 咳嗽 because conj. 因为为 seem v. 好像；似乎 convenient adj. 方便的；便捷的 1. I havent seen you since Tuesday. since prep. 自以来；是现现在完成时时的标标志时间时间 状语语之一， 其他，如:these days, for等表示过去已经开始、持续到现在（ 也许还会继续进行下去）动作或状态。 Eg：They have lived in Beijing since 1980. 他们自1980年就一直住在北京。 Weve known each other since we were children. 我们从小就认识。 2. Whats the matter(with you)? 类似的表达方式有： Whats wrong(with you)? Whats the trouble with you？ Is there anything wrong with you? Whats up? What happened (to you)?等,询问询问 某人最近发发生了某事。 3. I had to miss school. have to意为为“必须须，不得不” Eg：I had to tell him the truth. 我不得不告诉诉他事实实。 miss 漏掉；错过错过 ；想念 Eg：I was late because I missed the bus. 因为为没有赶上公交车车，我迟迟到了。 4. Im fine today, but I still have a cough. have a cough意为为“咳嗽” have a + 病症的词语词语 ，表示患有 某种病症或某部位不舒服； Eg：have a cold 感冒 have a flu 患流感 have a headache 头头疼 5. The doctor ask me to rest at home this week. ask sb. (not) to do sth. 让让某人（不要）做某事， 类类似用法还还有want, like , tell等。 Eg：Lily ask her mom to buy a cake. 6. We learn about famous mountains and rivers in geography. learn about 意为为“了解，学习习” Eg：I have learned about your school from your classmates. 7. Good for you. good for sb.称赞赞某人，意为为“真行，真棒”。 8. It seems hard. It seems意为为“某物或某事感觉觉怎么样样或者看起来怎么样样” Eg：It seems interesting. 9. Its a date. 一言为为定 since prep. 自以来；是现现在完成时时的标标志时间时间 状语语之一，表示过 去已经开始、持续到现在（也许还会继续进行下去）动作或状态 。 Whats the matter(with you)? 你怎么了？ have to 必须须，不得不 have a + 病症的词语词语 患有某种病症或某部位不舒服； ask sb. (not) to do sth. 让让某人（不要）做某事 learn about 了解，学习习