Question

We___ prepare our lessons well before examination (ought to,must)

Answer 1

The answer is 'must.'

We must prepare our lessons well before the examination.

• The determiner 'must' is used to indicate the necessary actions that we must carry out for our good.

• 'Must' is placed before those actions that are bound by time and responsibility.

• However, 'ought to' is placed before the actions that we are obliged to do. It defines the works which are our duties.

Answer 2

The right answer is :We ought to prepare our lessons well before examination.

Explanation:

• Ought to is used to make some recommendations.
• It also helps in expressing expectation or assumption as well as a very strong probability, often with the idea that something is deserved.
• It is a type of modal verb and helps in indicating the right way to behave in that particular situation , or some sensible thing to do during a particular moment.
• Ought to have the negative form ought not to but the not is not usually pronounced as full. When we write what someone says, we write oughtn't to.
• Note: "Ought to" loses the word "to" in the negative form.
• Rather than using "ought not to", we use the words as "ought not".
• In British English, "Ought not" is more commonly used than should not.