Chinese Irregular Verbs: One Verb, All Its Forms, Explained Step by Step

Every week a student asks me the same nervous question: "Mei, where is the list of Chinese irregular verbs?" I always smile, because the honest answer surprises them. Chinese has no conjugation tables like English does — no go/went/gone, no be/was/been. But Chinese is not "easy" here; it just hides its irregularity somewhere else. The verb 是 (shì) — "to be" — is the perfect example. It looks simple, yet it bends in ways that trip up almost every English speaker. Today we take 是 apart, form by form, and you will finally see the logic instead of memorizing chaos.

The Big Secret: Chinese Verbs Don't Change Shape

In English, the verb itself carries the tense: I am, I was, I will be. In Chinese, the verb 是 stays frozen. The person never changes it, and the tense never changes it either.

So what changes? Only the pronoun in front. The verb 是 is the anchor that never moves. That is the whole "irregularity" — it is irregular because your English brain expects it to change, and it refuses.

Where the Real Trap Is: Negation and Tense

Here is where students actually lose points. To say "I am not," you do not touch 是 with "no." You put 不 (bù) in front:

Notice the tone shift: 不 is normally bù, but before 是 it becomes bú (second tone). Small detail, big difference in how you sound.

For past and future, you still do not change 是. You add time words:

• 我昨天是学生 — "I was a student yesterday"
• 我明天是学生 — "I will be a student tomorrow"

The verb is identical. Only 昨天 (zuótiān) and 明天 (míngtiān) tell the listener when.

我昨天是学生 (wǒ zuótiān shì xuésheng)

The Mistake Almost Everyone Makes with 是

English speakers love to insert 是 everywhere, because English is is everywhere. But Chinese drops it in many places. With adjectives, you do not use 是: