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Hello, I have two questions related to the grammar and vocabulary.

If you answer my questions, I thank you for answering.

Q1) ∙He posted a letter which he had written.

∙I found that I had lost my watch.

∙She suggested that she had gone there alone.

He insisted that he had gone to the meeting.

In the above four sentences, do you think the 'wrote',‘lost’, ‘went’, ‘went’, instead of 'had written',‘had lost’,‘had gone’,‘had gone’ are grammatically correct respectively?

Q2) What’s the difference between help and help out?

Please reply.

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Juniper KimIn the above four sentences, do you think the 'wrote',‘lost’, ‘went’, ‘went’, instead of 'had written',‘had lost’,‘had gone’,‘had gone’ are grammatically correct respectively?

The past perfect is much more natural in those sentences. The simple past does not sound correct to me.

Juniper KimQ2) What’s the difference between help and help out?

Help can have an infinitive after it.

(good) Please help your mother wash the dishes.
(wrong) Please help out your mother wash the dishes.
(wrong) Please help your mother out wash the dishes.

Hellp out is not followed by an infinitive. The prepositional phrase "with" is optional.

Please help your mother out with the dishes. 

These are about the same:

Please help your mother.
Please help your mother out.
Please give your mother a helping hand.

Comments  

I sincerely appreciate your answer.