Can you please check the following statements with me?

Thank you very much.

1.I suggested to my mum what she should buy for my father as a Christmas present.
2.My dad made (prepared) the Christmas lunch.What did he prepared for lunch?
3.On Epiphany I stayed all day with my family.
4.How many hours did it take you to finish the exercise? How long did it take..
5.Frequency adverbs are placed (?) between the subject and the main verb.
6.I played a lot of songs on my guitar.
7.On the following (the next is also correct) day I wrapped up the presents for my family.
8.I went to my cousin’s house and I exchanged presents with his family.
9.I went to my grandparents’ house (can you omit the word house?) for lunch.
10.We went to our parish because our parents were waiting for us there.
11.These Christmas holidays were really exciting because I enjoyed myself with my friends (?)

what am i checking for?

My dad prepared Christmas lunch. (I don't think you need the)

What did he prepare for lunch?
I went over to my grandparents for lunch.
How long did it take you to finish the exercise?

Sure! Let's go through each statement:

1. The sentence "I suggested to my mum what she should buy for my father as a Christmas present" is grammatically correct. It implies that you gave your mother a suggestion about what gift to buy for your father for Christmas.

2. The sentence "My dad made (prepared) the Christmas lunch. What did he prepare for lunch?" is also grammatically correct, but the question at the end should be "What did he prepare for lunch?" This implies that your dad was responsible for making the meal for Christmas lunch, and the question seeks to know what specific dishes he made.

3. The statement "On Epiphany I stayed all day with my family" is grammatically correct. It suggests that you spent the entire day with your family on the day of Epiphany.

4. The first part of the statement, "How many hours did it take you to finish the exercise?" is grammatically correct. However, the second part "How long did it take..." seems redundant. You can simply ask, "How long did it take you to finish the exercise?" Both phrases convey the same meaning and are commonly used.

5. The statement "Frequency adverbs are placed (?) between the subject and the main verb" is grammatically correct. However, the question mark should be replaced with the word "usually." The revised statement is "Frequency adverbs are usually placed between the subject and the main verb." This implies that in English grammar, frequency adverbs (such as always, often, sometimes) are commonly positioned between the subject and the main verb in a sentence.

6. The sentence "I played a lot of songs on my guitar" is grammatically correct. It means that you performed or played multiple songs on your guitar.

7. The statement "On the following day I wrapped up the presents for my family" is grammatically correct. It suggests that the day after a particular event, you wrapped the gifts for your family.

8. The sentence "I went to my cousin’s house and I exchanged presents with his family" is grammatically correct. It indicates that you visited your cousin's house and participated in exchanging gifts with their family.

9. The statement "I went to my grandparents’ house (can you omit the word house?) for lunch" is grammatically correct. The word "house" is not essential and can be omitted. So the revised statement would be "I went to my grandparents' for lunch."

10. The sentence "We went to our parish because our parents were waiting for us there" is grammatically correct. It means that you and others went to your parish or church because your parents were waiting for you there.

11. The statement "These Christmas holidays were really exciting because I enjoyed myself with my friends (?)" is grammatically correct, but the question mark at the end is unnecessary. It implies that you had an exciting time during the Christmas holidays because you enjoyed being with your friends.

I hope that clarifies everything for you! Let me know if you have any other questions.