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

• I guess she has a problem.
• I think she is making a mistake.
• I think that was a stupid thing to do.
• 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 coming.
• I don’t think you’ve met my wife.
• I don’t think she is telling the truth.
• I don’t believe she’s at home.
• I don’t think that they know each other.

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

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?