1. throw away
throw away 扔掉；拋棄；錯過
例句
It's wasteful to throw away glass,paper and metal.
I never throw anything away.
對話
A: It's already 10 o'clock, why are you still playing computer games?
B: Come on, I have been playing it for less than 1 hour.
A: Don't throw away the best years of your life.
B: Fine
2. or /otherwise
or /otherwise 否則
在祈使句後面加上or/otherwise意思是相當於漢語中的“否則，要不然的話”
例句
Hurry up, or we'll be late.
Put on your jacket, or you'll catch a cold.
對話
A: I'm very sorry, sir, my car has broken down.
B: Sorry to hear that. Can we do anything about it?
A: I'm afraid not.
B: Then I have to call another taxi, or I'll be late.
3. on the second thought
on the second thought 再三思索，仔細考慮
例句
on the second thought, I'm going home on this vacation.
I'll do it, On the second thought.
On the second thought, I won't tell her the truth.
對話
A: Would you care for a cup of coffee?
B: No, thank you.
A: I'm going to get one for myself, they make really good coffee here.
B: On the second thought, I will have a cup.
4. only to well
only to well, 這裏的only to表示很，非常，相當於very的意思
例句
I know only to well how you fell.
I'm only to pleased to help you.
The holiday was only to short.
對話
A: Harry is too down that won't talk to anyone.
B: I know only to well what's that like.
A: What do you mean?
B: I was very sad when I was laid off last year.
5. not really
not really 並不完全
例句
Do you hate other's smoking in the office? Not really.
Do you think we can get to station on time? Not really, unless we take a taxi.
對話
A: The road ahead is blocked, There might have been an accident.
B: Are there many accidents in the city every day?
A: Not really, but they are on the rise.
B: Please drive slowly, we're got lots of time, safety first.
6. look out
look out 小心
例句
Look out! There's a car coming.
Look out! You could fall of the edge here.
Look out! Harry, that step's not safe.
對話
A: Look out! A small boy is rushing out blindly.
B: Gee, how dangerous. I've almost knocked him down.
A: You stopped just in time, good for you.
B: I braked as hard as I could.
7. Let's split the difference
Let's split the difference 折中一下，一人讓一步
例句
OK. Let's split the difference, I'll take it.
Let's split the difference, I'll give you 100.
對話
A: This blouse is a special offer today, you can have it at 10% off the regular price.
B: It's nice ,but still too expensive, can you give me a 20% discount?
A: No, 10% is my last word.
B: Come on, Let's split the difference, 15%.
8. know better than
know better than 應該知道不該
例句
You should know better than to go swimming right after eating.
You are old enough to know better than to spend all your money on clothes.
對話
A: Harry, come here immediately!
B: What?
A: Don't take that one with me! I saw you hit your brouher.
B: No, He hit me first.
A: I don't care, You know better than to hit him, go sit on your bed for 10 minutes.
9. Let it be
Let it be 順其自然
例句
I decide to just let it be.
Let him be, he's doing no harm.
對話
A: Did you hear what he said to me?
B: I heard it.
A: What do you think I should do about it?
B: Just let it be. Her rudeness will come back to haunt her.
10. Let's make a bet
Let's make a bet 讓我們打個賭
例句
If you don't believe me, let's make a bet.
Let's make a bet, but I'll surely win.
Let's make a bet on the election.
對話
A: Do you think Tom will be elected president?
B: No, I think Harry will get it.
A: Let's make a bet on who gets it.
B: OK, loser buys pizza tomorrow night.