1
× i am 25 years old.
√ I am 25 years old.
We say I (NOT i) for the first person singular.
2
× My favourite day is saturday.
√ My favourite day is Saturday.
× I don’t like january.
√ I don’t like January.
We capitalise the days of the week and the months of the year: Monday, Tuesday, Wednesday, January, February, March, etc.
Note that we do NOT capitalise the names of the seasons (spring, summer, fall, autumn, winter): ‘He arrived in winter.’ ‘Next summer we want to go to Australia.’
3
× My wife is french.
√ My wife is French.
× I don’t speak german.
√ I don’t speak German.
We capitalise the names of races, languages and nationalities: Polish, Swedish, Catalan, Spanish, English, French, Greek, British, Native American, African American, Jewish, etc.