telephone (telephoned) try (tried) buy (bought)
have (had) be (been) see (seen) leave (left)
I have read the book/I haven't read the book.
I have stayed here for about two months.
She has gone to my hometown.
They have never been to the Great Wall.
现在完成时常与以下时间词连用：already, yet, never, before, for, since.
II．经典口语习语、词组、谚语 (PHRASES / IDIOMS / PROVERBS)
● sell like hot cakes
● Let sleeping dogs lie.
● It is never too late to learn.
● Where there is life there is hope.
III．地道情景表达 (SITUATIONAL EXPRESSIONS)
— What can I do for you, madam?
— How do you like this one?/What about ...?
— I'm looking for .../I'm thinking of buying ...
— What do you want to buy for your wife?
— What size?/What color? Size five./Green.
— These are in fashion this year. Don't you want a try?
— I prefer the blue one to the red one./ — I like ... better.
— It looks good. Can I try it on? Where's the fitting room?
— It suits you./Perfect!
— Come on. You are kidding. I'm no longer in my twenties.
— Oh, it's a pity. It looks beautiful, but it doesn't fit me.
— You can have a ..% discount.
— That's great. The price is reasonable.
— I'll take them. Can you pack them together for me?
— Comes ... Yuan in all.