They went swimming yesterday. So did we. 他们昨天去游泳了。我们也去了。
3、帮助加强谓语动词的语气：
I do like you. 我真的喜欢你。
She/He does like you. 她/他确实喜欢你。
She/They/We did go swimming yesterday. 她/他们/我们昨天确实去游泳了。
If you do know, answer me in a loud voice so that all may hear. 如果你的确知道，就大声回答我，以便大家都能听见。
be, have, do 都能做实意动词用：
These are computers. 这些是计算机。
We’re having breakfast. 我们正在吃早饭。
I did some washing last night. 我昨晚洗了衣服。
（四）助动词shall和will的用法 1、助动词shall/will构成一般将来时;should/would构成过去将来时
We shall/will be rich, if we succeed. 我们将很富有，如果我们成功的话。
They will be rich, if they succeed. 他们将很富有，如果他们成功的话。
They said they would be rich, if they succeeded. 他们说他们将很富有，如果他们成功的话。
2、shall 用在第一、三人称作主语的疑问句中，来征求意见，表示“要不要……”
Shall I go now? 要我现在就走吗?
Shall we invite her, too? 我们也邀请她吗?
Shall the house be insured against fire? 要给房子保火险吗?
Shall the reporters wait outside or what? 要记者们在外面等还是怎样?
3、shall 用于所有人称，表示说话人的决心、保证、许诺、威胁、警告、命令等强烈的感情。例如：
You shall have an answer by tomorrow. 到了明天，你会得到答复的。
If he’s good, he shall have a new watch for Christmas. 如果他表现好，在圣诞节就会得到一块新表。
You shall suffer for this. 你会为这事吃苦头/付出代价的!
I don’t want to be hard on them; they shan’t be pressed. 我不想难为他们;不会过于逼迫他们的。
They hope to undermine our unity; they shall fail. 他们希望破坏我们的团结：他们不会成功的。
If you children don’t do as I tell you, you shan’t go to the party. 你们小孩要是不听话，就不让你们参加晚会。
As a man sows, so he shall reap. 善有善报，恶有恶报。(谚语)
Then you shall come; and you will come too, Ruth, won’t you? 那你得来;Ruth，你也来好吗?
4、would 可以表示过去的习惯，类似used to:
He would come to see me on Sunday when he was here. 他在这里的时候，星期天就来看我。
The dog would lie there in the sun all afternoon. 那只狗常常整个下午躺在那里的太阳底下。
When we were children, we would go skating every winter. 小的时候，每年冬天我们都去滑冰。
5、will可以表示“愿意、肯、会、固执”等意义，而非将来: