Hi,
I have a question. Which of those sentences are correct and why? (It is word formation, where you have to use the word "ought")

1) You did not pay attention in class. (OUGHT)

Should I write:
a) You ought to pay more attention in class.
b) You ought to paid more attention in class.

2) It was careless of you to leave without locking the door. (OUGHT)

Should I write:
a) You ought to lock the door before you left.
b) You ought to have locked the door before you left.

Question

Hi, 
I have a question. Which of those sentences are correct and why? (It is word formation, where you have to use the word "ought")

1) You did not pay attention in class. (OUGHT)

Should I write: 
a) You ought to pay more attention in class. 
b) You ought to paid more attention in class.

2) It was careless of you to leave without locking the door. (OUGHT)

Should I write:
a) You ought to lock the door before you left.
b) You ought to have locked the door before you left.

Answer

Hey Veronika, I hope this helps:

Just to note: for each case you can say “ought to x” as long as its present tense:

You ought to pay more attention in class
You ought to lock the door when you leave

To answer your questions:
1 - A 
2 - B

Cheers!

Answer

Hello Veronika, I am just going to write the correct answers, if you want me to give you more explanation you can send me a message and I will reply you

1) a) You ought to pay more attention in class.

1) b) You ought to have locked the door before you left.

Answer

“ought to do something”
“Ought to pay more attention, ought to lock the door and ought to have locked”are all correct.