Các dạng của động từ
Dạng nguyên
/ˌʌndərˈstænd/
Past Simple
/ˌʌndərˈstʊd/
Past Participle
/ˌʌndərˈstʊd/
Câu ví dụ
Dạng nguyên · understand
- I understand your concerns about the project.
Past Simple · understood
- She understood the instructions immediately.
- Did you understand it before lunch?
- I understood it as soon as I possibly could.
- We understood it together earlier this week.
Past Participle · understood
- The message was understood by everyone in the room.
- We have never understood anything quite like it.
- He has understood it many times before.
- I have already understood it more than once.
Thì chính
| Hiện tại đơn | Quá khứ đơn | Hiện tại hoàn thành |
|---|---|---|
I understand he / she / it understands | I understood | I have understood |
| Hiện tại tiếp diễn:I am understanding · he / she / it is understanding | ||
Hướng dẫn ngữ pháp
The verb "understand" follows the ABB pattern: the past simple and past participle share one form ("understood"), while the base form ("understand") is different. ABB is the most common pattern among English irregular verbs — roughly half of all irregulars fall here, so mastering this group pays dividends across the whole language.
Use the past simple "understood" to talk about a completed action or event at a definite moment in the past. It stands alone as the main verb — no auxiliary is needed. Common accompanying time expressions include yesterday, last week, ago, and when: "She understood the whole report by herself." The action is seen as finished and anchored to a specific past time.
The past participle "understood" always works together with an auxiliary verb. It appears in: (1) the present perfect with have/has — "I have understood this several times before"; (2) the past perfect with had — "By the time we called, they had already understood"; (3) passive voice — "The decision was understood by the board." Never use "understood" as a standalone past-tense verb without an auxiliary.
Memory tip: because "understood" and "understood" are the same, you only need to memorise one past form. Many ABB verbs follow recognisable sound shifts — a large group ends in -ought (bring→brought, buy→bought, catch→caught, fight→fought, seek→sought, teach→taught, think→thought), and another group shows a vowel shift plus -t (feel→felt, keep→kept, leave→left, mean→meant, sleep→slept). Identifying which sub-group "understand" belongs to can make the form easier to remember long-term.
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