A: I've got to go to the embassy tomorrow to get a visa.

A: 我明天得去大使馆办签证。

B: Oh, you usually have to wait a long time.

B: 噢，通常情况下你要等很长时间。

A: I know.  There's always a long queue with lots of people.

A: 我知道。总是很多的人排很长的队伍。

B: But if you go early, it will be less busy.

B: 但是如果你去得早，就不会那么拥挤。

A: You're right.  If I go when the embassy opens, it won't be so busy.

A: 你说得对。如果大使馆一开门我就去，人就不会那么多。

B: That's what you should do.  Go early!

B: 你就应该这么做。早点去！

Notes 注释

1、I've got to . . . / I've got to . . . is the same as I have to . .  / I have to . . . or I must . . . / I must . . .eg I've got to go to the embassy tomorrow / I've got to go to the embassy tomorrow: You usually have to wait a long time / You usually have to wait a long time.

I've got to . . . /我得. . .和I have to . .  / 我不得不 . . .或者I must . . . / 我必须 . . .是一个意思。例如：I've got to go to the embassy tomorrow /我明天得去大使馆办签证。 : You usually have to wait a long time /通常情况下你要等很长时间。

2. Remember the way of giving advice using If . . . / If . . . eg: If you go early, it will be less busy / If you go early, it will be less busy.
记住用If . . . / 如果. . .来提出建议。例如：If you go early, it will be less busy /如果你去得早，就不会那么拥挤