Explanation

The phrase "believe in" is the standard and correct phrasal verb to express faith or confidence in something or someone.

The sentence "She always believes in her own abilities" correctly conveys her confidence and trust in her capabilities.

Explanation

The sentence should be: "I haven't had lunch with my mother since a year ago."

Since is used with a specific point in time (e.g., "since Monday," "since 2020," "since a year ago") to indicate when an action started that is still true or relevant to the present.

Explanation

The preposition "at" is used for a precise or specific point in time.

Since midnight is a very specific moment, "at" is the correct choice.

Explanation

The sentence describes two separate events in the past: "inviting Mary" and "Mary having dinner."

The past perfect tense ("had had") is used to indicate an action that was completed before another event in the past occurred.

In this case, Mary finished her dinner before the invitation was extended.

Explanation

In conditional sentences with If + past tense, we use would + base verb in the main clause.

If I won the lottery, I would buy a house in the country.