THEREFORE
A. Dùng "therefore" như một liên từ nhằm giới thiệu một mệnh đề độc lập.
Có 3 hình thức để nối các câu riêng biệt bằng "therefore".
1. Bắt đầu một câu riêng biệt bằng "therefore", theo sau là dấu phẩy:
The players were my heroes. Therefore, my dad was my hero because he was the coach.
This is a binding contract. Therefore, we recommend that you review it with a lawyer.
2. Dùng một dấu chấm phẩy trước "therefore" và theo sau là dấu phẩy:
The players were my heroes; therefore, my dad was my hero because he was the coach.
This is a binding contract; therefore, we recommend that you review it with a lawyer.
3. Thêm một liên từ trước "therefore" để nối hai mệnh đề độc lập (trước cụm từ này có dấu phẩy):
The players were my heroes, and therefore my dad was my hero because he was the coach.
This is a binding contract, and therefore we recommend that you review it with a lawyer.
B. Nhưng khi "therefore" mang chức năng của một trạng từ, thì "therefore" hoặc "and therefore" hoàn toàn đứng giữa câu:
The new boots are lighter and softer, and therefore more comfortable to wear.
I no longer have the support of the committee. I have therefore decided to resign.
He's only 17 and therefore not eligible to vote.
There is still much to discuss. We shall, therefore, return to this item at our next meeting.