Explanation

If I see him, then I will give him your message.

This is a Type 1 conditional (real possibility in the future): If + present simple, will + base verb.

"Will give" is the correct future tense; the subject is "I" and the object is "him".

Explanation

"The dog was barking at the beggar."

The correct preposition to use with "barking" when referring to targeting someone is "at".

Explanation

I had been working since 2 O’clock.

"Had been working" is past perfect continuous tense.

It is used to show an action that started in the past and continued up to another point in the past.

"Since" is used with a specific point in time (like 2 O’clock).

Explanation

The sentence "She will have left before you go to see her." 

It requires a future perfect tense (will have + past participle) because it describes an action that will be completed before another future action ("you go to see her").

Explanation

"Unless" means "except if" and fits logically here:

• The speaker is saying, "Do not watch TV except if I have nothing to do."

"Unless" introduces the only condition when watching TV is allowed.

Explanation

We use "the" before "dollar" because we are referring to the official, specific currency of the United States (a unique entity).

"The dollar" functions like a proper noun in this context (similar to "the euro" or "the yen").

Explanation

"I asked who had done it."

The original sentence is a direct question in past tense ("Who did it?").

In reported speech:

The reporting verb "said" changes to "asked" (as it's a question)

The past simple "did" changes to past perfect "had done" (standard tense change in reported speech)

The question structure changes to indirect statement structure (no question mark needed)

The word order changes from question form to statement form

Explanation

"You told me that water freezes at 0°C."

The original sentence is a statement of a general/scientific fact ("Water freezes at 0°C").

In reported speech:

• "Said to" changes to "told" (more natural for reported speech)
• The tense remains present ("freezes") because it's a universal truth
• The conjunction "that" is properly used
• The factual information remains unchanged

Explanation

"They exclaimed with disgust that there was a cockroach there."

The original sentence shows an exclamation ("Ooch!") expressing disgust at seeing a cockroach.

In reported speech:

• The interjection "Ooch!" becomes "exclaimed with disgust"
• The present tense "is" changes to past tense "was"
• "Here" changes to "there" (as required in reported speech)
• The conjunction "that" is added

Explanation