Question

You must learn the lesson...... heart. (Preposition)
By
In
At
For

Answer 1

The correct preposition to use in the sentence is:

You must learn the lesson by heart.

What are prepositions?

• In English Grammar, prepositions can be described as words which are added before a noun or noun phrase.
• Prepositions link the words in a sentence.
• The preposition 'by' is very common in sentence and used for multiple purposes.
• When a person needs to learn something, we use the term learn by heart where by is the preposition.