2 Lies is NOT the plural form.
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You have to be able to differentiate the difference between he verbs lie and lay. Notice that that in these questions, all the words you have been provided with, are in present tense.

to lay: is to put something down

to lie: is to rest or recline.

His greatness was not put down on a fact, instead it rested on a fact.

The verb lie in simple past is written as lay. The sentence becomes in past tense because firstly, the mentioned person is dead, and secondly, the verb have(7) is in past tense. You have to maintain the same tense throughout the sentence.

Therefore:

His greatness lay in the fact that he had a pure heart, devoid of malice.

When you say "lies", it is still in present tense, just in plural. For further info

You have to be able to differentiate the difference between he verbs lie and lay. Notice that that in these questions, all the words you have been provided with, are in present tense.

to lay: is to put something down

to lie: is to rest or recline.

His greatness was not put down on a fact, instead it rested on a fact.

The verb lie in simple past is written as lay. The sentence becomes in past tense because firstly, the mentioned person is dead, and secondly, the verb have(7) is in past tense. You have to maintain the same tense throughout the sentence.

Therefore:

His greatness lay in the fact that he had a pure heart, devoid of malice.

When you say "lies", it is still in present tense, just in plural. For further info

You have to be able to differentiate the difference between he verbs lie and lay. Notice that that in these questions, all the words you have been provided with, are in present tense.

to lay: is to put something down

to lie: is to rest or recline.

His greatness was not put down on a fact, instead it rested on a fact.

The verb lie in simple past is written as lay. The sentence becomes in past tense because firstly, the mentioned person is dead, and secondly, the verb have(7) is in past tense. You have to maintain the same tense throughout the sentence.

Therefore:

His greatness lay in the fact that he had a pure heart, devoid of malice.

When you say "lies", it is still in present tense. For further info

1
source | link

You have to be able to differentiate the difference between he verbs lie and lay. Notice that that in these questions, all the words you have been provided with, are in present tense.

to lay: is to put something down

to lie: is to rest or recline.

His greatness was not put down on a fact, instead it rested on a fact.

The verb lie in simple past is written as lay. The sentence becomes in past tense because firstly, the mentioned person is dead, and secondly, the verb have(7) is in past tense. You have to maintain the same tense throughout the sentence.

Therefore:

His greatness lay in the fact that he had a pure heart, devoid of malice.

When you say "lies", it is still in present tense, just in plural. For further info