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you will be late.
这个句子可以改写为：
You will be late if you take the bus to the party.
if从句
主句
条件状语从句表示主句动作发生的条 件，通常由 if 来引导，意为“如果”。
时态：
1. 如果主句是一般将来时，从句常用一般现在时。即应遵循“主将从现”的原则，
If she comes to see me tomorrow, I’ll be happy.
If it snows tomorrow, I will not go to the park.
won’t
2. 如果主句含有must /can/may 等情态动词，从句一般用___________。
You must stop if the traffic light ____ (be) red.
is
一般现在时
3. 如果主句是祈使句， 从句也常用___________。
一般现在时
Please stay at home if it _____ (rain) tomorrow.
rains
What tenses do the sentences use?
一般现在时
一般将来时
1. — I think I’ll take the bus to the party.
— If you do, you’ll be late.
2. — I think I’ll stay at home.
— If you do, you’ll be sorry.
3. — What will happen if they have the party today?
— If they have it today, half the class won’t come.
4. — Should we ask people to bring food?
— If we ask people to bring food, they’ll just bring potato chips and chocolate.