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Here are some sentences in American English. How would they be different in British English?

1) The president was in Moascow Tuesday.

2)Don't forget to write me.

3)He loves to read in bed.

4)I already boiled the water,but I didn't make the coffee yet.

Thanks for explanations.
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In standard BrE:

1) The president was in Moscow on Tuesday.

2) Don't forget to write to me.

3) He loves to read in bed.

4) I've already boiled the water, but I haven't made the coffee yet.
Comments  
Actually, #4 in American English would be "... but I haven't made the coffee yet."
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 Mr Wordy's reply was promoted to an answer.
3) He loves to read in bed. It remains th same,nothing is going to change for the Brithish English?
Evo253) He loves to read in bed. It remains th same,nothing is going to change for the Brithish English?

That's right. "He loves to read in bed" is fine in British English.
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Also, Mr. Wordy's 1, 2 and 4 would be fine in American English as well. No one would think they sounded off. I may even use the present perfect on both parts of #4 myself, though I would certainly use it for the second part of the sentence.