你不该让他们等那么久。

You shouldn't keep them waiting so long.

Source: Tatoeba

Sentence Composition

=1 你 nǐ you (informal, as opposed to courteous 您 nín)
=1 你 nǐ you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
2 不该 bùgāi
  1. should not
  2. to owe nothing
3 让 ràng
  1. to yield
  2. to permit
  3. to let sb do sth
  4. to have sb do sth
  5. to make sb (feel sad etc)
  6. by (indicates the agent in a passive clause, like 被 bèi)
4 他们 tāmen they; them
5 等 děng
  1. to wait for; to await
  2. by the time; when; till
  3. and so on; etc.; et al.
  4. (bound form) class; rank; grade
  5. (bound form) equal to; same as
  6. (used to end an enumeration)
  7. (literary) (plural suffix attached to a personal pronoun or noun)
=6 那么 nàme
  1. like that; in that way; to that extent
  2. (before a number) ... or so; about ...
  3. then; in that case
=6 那么 nàme variant of 那么 nàme
7 久 jiǔ (of a period of time) long