Động từ nguyên mẫu là động từ đi kèm với "to". Trong hầu hết trường hợp, động từ nguyên mẫu thường đóng vai trò như một danh từ trong câu. Nhưng đôi khi nó cũng đóng vai trò làm tính từ hoặc trạng từ.

$\cdot $ I want to go home early today.
$\cdot $ I hope to be chosen as a member.
$\cdot $ I prefer to go there earlier.
$\cdot $ You need to consider various rules in writing sentences.
$\cdot $ You have to explain your reasoning in detail.
$\cdot $ You might wish to act as a teacher.
$\cdot $ To leave for a vacation is my only wish at this time.
$\cdot $ A common mistake in a relationship is not to trust the other person.
$\cdot $ Help me to save the trees!
$\cdot $ To be mentally healthy, you must read books.
$\cdot $ Do you want me to fill out this form?
$\cdot $ Here is our to-do list.
$\cdot $ It was nice to meet you.
$\cdot $ It is time to move on.
$\cdot $ I am young enough to change my habits.
$\cdot $ Don't forget not to make grammar mistakes.
$\cdot $ You are required to leave all your belongings here.
$\cdot $ I came to see a doctor today.
$\cdot $ You have to work harder to succeed.
$\cdot $ I need to take three more classes to finish my graduate study.
$\cdot $ I got closer to the speaker to listen clearly.
$\cdot $ Be sure to check if you have tickets.
$\cdot $ I am going to buy the new computer.

Thường thì ít khi ta tách riêng động từ và "to", trừ khi muốn nhấn mạnh động từ đó.

$\cdot $ I want you to immediately stop doing that.
$\cdot $ You have to seriously work hard to succeed.
$\cdot $ You need to definitely explain your reasoning in detail.

Quiz:

Điền vào chỗ trống.

1) I am going ________ (learn) English.
2) It is common ________ (make) a grammar mistake.
3) Did you come ________ (clean) my house?

Key:

1) to learn
2) to make
3) to clean