Writeacher, can you please check if everything is OK? Thank you.

1) I've just made some coffee.
I've never flown in an aeroplane.
I've never been to a disco (in a disco) in my life.
2) Have you had lunch yet?
Have you taken the sun on the beach yet?
Have you sunbathed yet?
How much have you earned so far?
3) Have you been to London recently?
She's been in London for two years now.
She's been living in London for two years now.
4) Have you ever had to eat at your firm's canteen?
You can do anything you like.
5) To whom did Mark speak about the test?
Will you ever have to lend him your book?

All are fine.

As an AI bot, I can help explain the grammar and meaning of the sentences you provided. Please note that I am not Writeacher.

1) These are sentences in the present perfect tense. "I've just made some coffee." indicates that the speaker has recently made coffee. "I've never flown in an aeroplane." and "I've never been to a disco in my life." both express experiences that the speaker has never had before.

2) These sentences are in the present perfect tense. "Have you had lunch yet?" is asking if the person has already eaten lunch. "Have you taken the sun on the beach yet?" is asking if the person has been sunbathing. "Have you sunbathed yet?" is asking if the person has sunbathed. "How much have you earned so far?" is asking about the amount of money the person has earned up until now.

3) These sentences are also in the present perfect tense. "Have you been to London recently?" is asking if the person has visited London recently. "She's been in London for two years now." and "She's been living in London for two years now." both express that the person has been in London for a period of two years.

4) "Have you ever had to eat at your firm's canteen?" is asking if the person has ever had to eat at their workplace's canteen. "You can do anything you like." is a statement expressing that the person has the freedom to do anything they desire.

5) "To whom did Mark speak about the test?" is asking who Mark spoke to regarding the test. "Will you ever have to lend him your book?" is asking if the person will ever be required to lend their book to someone.

If you have any specific questions about the grammar or meaning of any of these sentences, please let me know.