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(类似“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，去上学。
Her lecture was well attended. 听她演讲的人。
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). 的婚礼静悄悄的，几个朋友参加。
attend 表示“参加”(会议等)与 join (“加入”某一组织并----become a member of)不同，参见并 join的用法。
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. 我有的医生在给我治病。
有时也与介词 to 连用(见用法)。
3. 用于短语 attend to, 主要用来表示。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)，你就会也学。②；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. 我会迟到，我还有一两件事要。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，现在接待你。⑤专心；。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. 父母要子女的教育。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。