The correct answer is "She studies English every day". The subject She is third person singular, so the verb must end with s. The time marker every day indicates present simple tense.

The correct answer is "Went". The word yesterday indicates a completed past action, so the past tense went is correct.

The correct answer is "I saw an elephant at the zoo". The word elephant begins with a vowel sound, so the article an is used.

The correct answer is "The students are preparing for the exam". The subject students is plural, so the verb must be are.

The correct answer is "She has completed her assignment". The present perfect tense is formed with has or have plus the past participle.

The correct answer is "In". The correct preposition after interested is in. He is interested in science.

The correct answer is "She don't like coffee". The subject She is third person singular, so the negative auxiliary should be doesn't, not don't.

The correct answer is "This book is more interesting than that one". For adjectives with two or more syllables, the comparative form uses more plus the adjective.

The correct answer is "After the meeting, we went for lunch". A comma is correctly placed after the introductory phrase "After the meeting".

The correct answer is "The report was written by the manager". The passive voice uses the past participle written after the appropriate form of to be was.

The correct answer is "If it rains, we will stay indoors". This is a first conditional sentence: if plus present simple, then will plus base verb.

The correct answer is "Neither of the answers is correct". Neither is singular, so it takes a singular verb is.

The correct answer is "She goes to school every day." Present simple for third person singular requires the verb to end with s or es.

The correct answer is "An". The word apple begins with a vowel sound, so the article an is used.

The correct answer is "Ate". Eat is an irregular verb; its past tense is ate.

The correct answer is "He doesn't like coffee." The auxiliary verb does is used with the base form of the verb for third person singular negative.

The correct answer is "Beautiful". An adjective describes a noun. Beautiful describes the quality of something.

The correct answer is "Children". Child is an irregular noun and its plural form is children.

The correct answer is "She is good at math." The correct preposition to show skill or ability is at.

The correct answer is "Taller". For one-syllable adjectives like tall, the comparative form adds er.

The correct answer is "I will go tomorrow." The future simple tense is formed with will plus the base form of the verb.

The correct answer is "She is always late." The adverb of frequency always comes after the verb to be.

The correct answer is "The book was written by him." The passive voice uses the past participle written after the appropriate form of to be.

The correct answer is "If I see him, I will tell him." This is a first conditional sentence with if plus present simple, then will plus base verb.

The correct answer is "You must finish it." The modal verb must is followed directly by the base form of the verb, not to or an ing form.

The correct answer is "I have lived here since 2010." Since is used with a specific point in time and requires the present perfect tense.

The correct answer is "There are many people." The subject people is plural, so the verb must be are.

The correct answer is "He said he was tired." In reported speech, the present tense is changed to the past tense.

The correct answer is "I stayed home because it was raining." Because is a conjunction followed by a full clause with a subject and verb.

The correct answer is "I want to go home." The verb want is followed by an infinitive: to plus the base form of the verb.

The correct answer is "She has gone to the store." The present perfect uses has or have plus the past participle. Gone is the past participle of go.

The correct answer is "He is too tired to work." The structure is too plus adjective plus infinitive, meaning excessively.