Explanation

Explanation

We use at for a specif location.

At is a preposition here.

Who is waiting at the door?

Explanation

When things happen we use the word with to explain where things are. 

His hands numbed with cold. 

Explanation

The definite article (the) is used before a noun to indicate that the identity of the noun is known to the reader

Explanation

Certain words when used in “Active Voice”  are not followed by any preposition.

“Accompany, affect, consider, compromise, emphasize, resemble, ensure, attack, invade, order, reach, describe, discuss, tell” etc.

He discussed the topic with me. 

Explanation

Preposition connect the words

Explanation

Base Form (Infinitive): To Feel

Past Simple: Felt

Past Participle: Felt

3rd Person Singular: Feels

Present Participle/Gerund: Feeling

Explanation

Crowded is used as adjective in this sentence

Explanation

If you find yourself debating whether to use “was” or “were” in a sentence, it’s likely that you’re dealing with an unreal conditional sentence. As a refresher, an unreal conditional sentence expresses events that are hypothetical or improbable.

Explanation

Given sentence is in Past simple tense and it is in active voice, we need to change it into passive voice.

Rule :
Subject + (was / were) + V3 + Optional Agents.