Fix Formula - 该……了
— 该……了
Understand the usage of 该……了 and their placement in a sentence.
Elements
该……了
How to use it
- For 该, take a model sentence like 该怎么办？ (What should we do?) and replace only the variable information.
- For 了, take a model sentence like 吃了饭再去图书馆。 (Eat first, then go to the library.) and replace only the variable information.
- After substitution, verify that 了 / 不 / 没 / 吗 remain coherent with the meaning and time of the sentence.
- Context: especially in questions and answers.
Examples
该怎么办？
gāi zěnme bàn?
What should we do?
吃了饭再去图书馆。
chī le fàn zài qù tú shū guǎn
Eat first, then go to the library.
我明白了。
wǒ míng bái le
I understand.
Notes and exceptions
- 了 — Aspect / change of state: Indicates an accomplished event or a change in the situation.
- Note: 了 is not required in all past sentences.
Common mistakes
- Check the order of elements before speaking or writing.
- Use a complete sentence to validate the structure in a real context.
Practice quiz
Choose the best option for each sentence, then submit to view the correction.
1. ____怎么办？
(What should we do?)
2. 吃____饭再去图书馆。
(Eat first, then go to the library.)
3. 我明白____。
(I understand.)