Explanation

We use "a little" with uncountable nouns like "French" (as a language).

It means "some" or "a small amount."

Explanation

Explanation

 "Though I am afraid of dogs, my sister, however lets her dog without a leash." 

Explanation:

"Though"

is used to introduce a clause that is in contrast to the main clause. 

"However"

is used to introduce an adverbial that contrasts the previous statement.

Explanation

"Did not stop" is the correct past tense form of the verb "stop".

"Covered" is the simple past form that matches the sequence of past events.

This sentence follows the structure of two completed actions in the past.

Correct sentence:

"Ali did not stop studying until he covered all the exam topics."

Explanation

The sentence needs a past participle form of the verb "repair" after the preposition "have,"

This indicates that the electrician should have the switch repaired.

The structure "have someone past participle something" means that someone else should get something done by someone else.

Explanation

The rain continued for most days when we were in Lahore, but fortunately, there wasn’t much damage in the city.

 "Most" refers to a large portion of time; "much" fits the uncountable noun "damage".

Explanation

Sara is the tallest girl in our school.

“The tallest” is a superlative form that compares more than two.

Explanation

 The correct structure is “so + adjective + that” to show cause and effect.

"The question paper was so complicated that it was completely incomprehensible."

Explanation

The phrase "needn't have gone" indicates that the action was unnecessary but was done anyway.

This is the correct use of "needn't have" in a past context to express regret or realization.

Explanation

The phrase "Would you be so kind as to" is a polite way of making a request.

"Would you be" is the correct structure for this polite form of asking.