记熟以下几句就行了1. If weather permit, we will go to the park tomorrow. 如果天气好的话，明天我们去公园。
2. Listen to the tune see if you can remember the words. 请听这曲子--看你能不能想得起曲词来。 3. If he wins and it's a big if he'll be the first Englishman to win for twenty years. 假使他赢了--是否能赢还是一大疑问--他将是二十年来第一个获胜的英国人。
4. Even if you saw him pick up the money, you can't be sure he stole it. 就算你看见是他拾起的钱，你也不能肯定钱就是他偷的。 5. I wonder if I should wear a hat. 我不知道该不该戴帽子。
6. I'm not sure whether to resign or stay on. 我拿不准主意是辞职还是留任。 7. Do you know if he's married？ 他结婚没结婚，你知道吗？ 8. She glares at me if I go near her desk. 我一走近她的办公桌，她就瞪我。
2. 关于if的句子记熟以下几句就行了
1. If weather permit, we will go to the park tomorrow.
如果天气好的话，明天我们去公园。
2. Listen to the tune see if you can remember the words.
请听这曲子--看你能不能想得起曲词来。
3. If he wins and it's a big if he'll be the first Englishman to win for twenty years.
假使他赢了--是否能赢还是一大疑问--他将是二十年来第一个获胜的英国人。
4. Even if you saw him pick up the money, you can't be sure he stole it.
就算你看见是他拾起的钱，你也不能肯定钱就是他偷的。
5. I wonder if I should wear a hat.
我不知道该不该戴帽子。
6. I'm not sure whether to resign or stay on.
我拿不准主意是辞职还是留任。
7. Do you know if he's married?
他结婚没结婚，你知道吗？
8. She glares at me if I go near her desk.
我一走近她的办公桌，她就瞪我。
3. 英语中用if开头的句子结构If 可以引导宾语从句表示“是否”的含义，也可以引导条件状语从句表示“如果”的含义。你要问时态的话那就要搞清楚它在引导条件状语从句时所用的虚拟语气的问题了。
a. 与现在事实相反的假设
条件从句 主句
一般过去时（be用were） should(would)等 +动词原形
例如：If they were here, they would help you. 如果他们在这儿，会帮助你的。
含义：They are not here, they can't help you.
b. 与过去事实相反的假设
条件从句 主句
过去完成时 should(would)等+ have+ 过去分词
例如：If he had come yesterday, I should / would have told him about it.如果他昨天来的话，我会把这件事告诉他的。
含义：He did not come yesterday, so I did not tell him about it.
c. 表示对将来不大可能发生的事情的假想
条件从句 主句
一般过去时 should/would等 + 动词原形
were+ 不定式
should+ 动词原形
例如：If you succeeded, everything would be all right. 如果你将来成功了，一切都会好的。
If you should succeed, everything would be all right.
If you were to succeed, everything would be all right.
含义：You are not likely to succeed, everything will be what it is now.
4. 每一句用if 开头写小短文五句之内的If you take this medicine,all your symptoms will fall away.
如果你使用这种药物，你的所有症状将会消失。
If he is no good, flunk him.
如果他表现不好，给他不及格。
If you cannot do it, I will understand.
如果你不能做这件事，我可以谅解
If you grasp this rope, I will pull you up.
如果你抓住这根绳子，我可把你拉起来。
If you ask him, he will help you.
假如你向他请求， 他会帮助你。
5. 用if 作为每句的开头做一首英文诗（不少于10句）If I never met you
If you were not that shining
If I could turn my eyes off you
If I could control my heart
If I could stop thinking about you
If we could spent less time together
If I hadn't come to you that day
If you never said you love me too
If we had less sweet memeory
If I could forget you once we had to go our separate ways.
If all of these are only if.
