I left out a few more doubts. Thank you very much.

1)Can you use the plural form with the word family? Example: When my family were speaking? (is it a mistake??)
2)I had lunch and then I got ready to go out.
3)They will use nearly only their motorbikes. They will use the plane to fly back to London.
4)an you use the word "bike" meaning "motorbike"?
They journey will end in the USA, more precisely in New York.
5) When I arrived at school, I greeted my friends and I entered the school (does this sentence make sense?)
6) "We are doing this journey for chaarity",adds Simon. "Lots of our friends have sponsored us and if the journey goes well, we'll raise a lot of money for UNICEF".
Question: Will they get money from friends if they complete the trip? Yes, they will but they will raise it for UNICEF. (Is it correct?)
7) I may support a charity during next years (is it correct?)

1. It is a mistake because "family" is a collective unit and therefore IS.

4. Yes, if it's clear to everyone that that IS the antecedent.
THEIR journey OR They will end the journey...
5) OK
6) spelling "charity"
Question = corect
7) during next year (singular) OR during the next few years (plural)

Sra

1) No, it is not correct to use the plural form with the word "family." The word "family" is considered a collective noun, which means it is treated as a single entity even though it may refer to multiple individuals. Instead of saying, "When my family were speaking," it would be correct to say, "When my family was speaking."

2) This sentence is grammatically correct. It describes a sequence of events: first, the person had lunch, and then they got ready to go out.

3) The sentence is correct, but there is a small grammatical error. Instead of saying, "They will use nearly only their motorbikes," it would be more correct to say, "They will use mainly their motorbikes." This sentence means that they will use their motorbikes for most of their trip, except for when they use the plane to fly back to London.

4) Yes, the word "bike" can be used to refer to a motorbike. However, it is more commonly used to refer to bicycles. To clarify that you are talking about a motorbike, it would be better to specify by saying "motorbike" instead of just "bike."

5) Yes, the sentence "When I arrived at school, I greeted my friends and I entered the school" makes sense. It describes the actions taken upon arrival at school, which include greeting friends and entering the school.

6) The statement in quotation marks is correct. If the journey goes well, they will raise a lot of money for UNICEF through the sponsorship of their friends. The sentence, "Yes, they will, but they will raise it for UNICEF," accurately reflects this.

7) The sentence "I may support a charity during next years" is not grammatically correct. It should be "I may support a charity during the next year" or "I may support a charity next year."