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Want, expect, and persuade someone to do something. A pattern distinct from plain verb + infinitive.
Why you specifically
Trong tiếng Anh, nhiều động từ như want, ask, expect, tell, persuade, invite, encourage, advise, remind thường theo cấu trúc: động từ chính + tân ngữ + to + động từ nguyên mẫu. Tân ngữ là người sẽ thực hiện hành động. Ví dụ: I want you to help me, She persuaded him to apply, The teacher asked us to sit down. Điểm này khác với cấu trúc động từ + to-infinitive đơn thuần, như I want to help, vì ở đó không có tân ngữ chen giữa động từ chính và to-infinitive. Người học tiếng Việt hay bỏ to sau tân ngữ vì trong tiếng Việt có thể diễn đạt gần giống trực tiếp hơn, nhưng trong tiếng Anh cách đó thường sai. Hãy nhớ: nếu có người được tác động làm gì, thường cần object + to + verb.
The rule
With verbs like want, ask, expect, tell, persuade, and invite, English often uses this pattern: verb + object + to-infinitive. The object is the person who does the action, and to-infinitive shows the action itself: I want you to help, She persuaded him to apply, The teacher asked us to sit down. This is different from plain verb + infinitive, where there is no object between the main verb and to: I want to help, not I want me to help. Vietnamese learners often transfer the Vietnamese pattern too directly and omit to after the object. In English, that is usually wrong.
Both correct
Every sentence here is correct English. Only the meaning changes.
I want to leave early.
The person himself/herself is the one doing the action.
I want you to leave early.
A different person is being asked or expected to do the action.
The trap
I want you help me with this report.
I want you to help me with this report.
After want, expect, persuade, and similar verbs, English uses an object + to-infinitive. Vietnamese often leaves out the object-to pattern or uses a direct infinitive idea.
The manager asked us arrive early.
The manager asked us to arrive early.
Ask also follows object + to-infinitive. The wrong sentence leaves out to, which makes the structure ungrammatical.
She persuaded her friend join the club.
She persuaded her friend to join the club.
Persuade requires an object and then to + verb. Vietnamese learners often produce a bare infinitive after the object, but English does not allow that here.
We expected them finish the task today.
We expected them to finish the task today.
Expect takes object + to-infinitive. The wrong sentence is not standard English because the to is missing before the verb.
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