The more …, the more: càng … càng

Càng … càng links two things that grow together, like English "the more …, the more …". Put càng before each of the two verbs or adjectives: Càng nghĩ càng buồn. The more I think about it, the sadder I feel. Tiếng Việt càng học càng thấy hay. The more I learn Vietnamese, the more I enjoy it.

When the two halves have different subjects, each keeps its own, and thì often joins them: Em càng giải thích thì sếp càng giận. The more I explained, the angrier my boss got. Càng comes after the person and right before the verb or adjective.

With tốt (good) at the end, it means "the …er, the better": Càng sớm càng tốt. The sooner the better. It's a handy phrase at work: Anh gửi cho em càng sớm càng tốt nha.

You know ngày càng (more and more): Sài Gòn ngày càng đông. That's the same càng, with time as the first half. Use càng … càng when one change brings the other with it.