To express your opinions, use an expression like I think … or I guess …

I think she is making a mistake.

I think that was a stupid thing to do.

I guess she has a problem.

I think you ought to try again.

The expressions I feel … and I reckon …. can also be used to express your opinions.

I feel she is right.

I reckon that was a mistake.

I really feel that she is hiding something from us.

If you do not think that something is true, use the expressions I don’t think… or I don’t believe…

I don’t think she is telling the truth.

I don’t think she is coming.

I don’t think that they know each other.

I don’t think you’ve met my wife.

I don’t believe she’s at home.

If you want to ask people what they think about something, use the structure What do you think of…?

‘What do you think of my new hairstyle?’ ‘Frankly, my dear, it’s a disaster.’

What do you think of his new project?

‘What do you think of her boyfriend?’ ‘He’s a fantastic guy.’

To ask someone if they think something is a good idea, use the structure What do you think about…? or How about…?

What do you think about joining an English speaking course? OR How about joining an English speaking course?

What do you think about going on a vacation?

What do you think about hiring a domestic help?