1. 表示“参加”、“出席”，通常用作及物动词，其宾语通常是meeting, party, show, wedding, class, lecture, school, church等(以及类似具有“活动”意义的名词)。如：
Did you attend the meeting yesterday? 你昨天去开会了吗?
He was ill and didn’t attend school. 他有病，没有去上学。
Her lecture was well attended. 听她演讲的人很多。
有时 attend 后的宾语可以省略，此时为不及物动词。如：
They had a quiet wedding --- only a few friends attended (it). 他们的婚礼静悄悄的，只有几个朋友参加。
attend 表示“参加”(会议等)与 join (“加入”某一组织并成为其中一个成员----become a member of)不同，参见并比较 join的有关用法。
2. 表示医生或护士等的“治疗”、“护理”、“照顾”等，可用作及物或不及物动词;用作不及动词时其后通常接介词 on(若省略，即为及物)。如：
Which doctor is attending you? 哪个医生在给你治疗?
She was attended by Dr Smith. 她由史密斯医生治疗。
I have a good doctor attending (on) me. 我有一个很好的医生在给我治病。
有时也与介词 to 连用(见以下有关用法)。
3. 用于短语 attend to, 主要用来表示。如：
①注意听。如：
Attend carefully (to what he’s saying). 注意听(他讲的话)。
If you don’t attend (to your teacher)，you will never learn anything. 你要是不注意听(老师讲)，你就会什么也学不到。②处理;办理。如：
I’ll attend to it. 这事我来办。
I may be late----I have one or two things to attend to. 我可能会迟到，我还有一两件事要处理。③照顾;照看。如：
If you go out, who will attend to the baby?你要是出去，谁来照顾婴儿?
Will you attend to the shop for a few minutes while I go to the bank? 在我去银行时你帮我照看一下店铺好吗? ④接待;招待。如：
Are you being attended to, sir? 先生，有人招呼你了吗?(主要用于店员招呼顾客用)
I’m too busy. I can’t attend to you now. 我很忙，现在不能接待你。⑤专心;关心。如：
Attend to your work and stop talking. 专心工作，不要说话。
Parents must attend to the education of their children. 父母必须要关心子女的教育。⑥治疗;医治。如：
His injury was attended to by a young doctor. 他的伤由一位年轻医生医治。
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