Как по британскому будет 2.00,2.15,2.30,2.45.

2.00 - Two AM (читается - эй эм)
2.15 - Two fifteen AM
2.30 - Two thirty AM
2.45 - Two forty five AM

AM - это утро и ночь. То есть с 12.00 (00.00) до 12.00 (полдень) AM.
PM - это денек и вечер. С 12.00 (полдень) до 00.00 (ночь).

Так в главном разговаривают для краткости. Если учительница будет против такого ответа, то ниже есть еще варианты:

2.00 two o'clock am, two o'clock, zero-two-zero-zero hours, zero two hundred hours (так разговаривают военные)

2.15 two fifteen am, quarter past two am, fifteen minutes past two am, three quarters to three am, fourty-five minutes to three am, two fifteen, quarter past two, fifteen minutes past two, three quarters to three, fourty-five minutes to three

2.30 - two thirty am, half past two am, thirty minutes past two am, thirty minutes to three am, two thirty, half past two, thirty minutes past two, thirty minutes to three

2.45 quarter to three am, fifteen minutes to three am, two fourty-five am, three quarters past two am, fourty-five minutes past two am, quarter to three, fifteen minutes to three, two fourty-five, three quarters past two, fourty-five minutes past two

Так и будет, а если про произношение, то скорее всего: two dots zero zero, two dots fifteen, two dots thirty, two dots forty-five