Speak - говорить на языке либо говорить перед большой аудиторией.
He can speak English. Он говорит по-английски.
The king speaks.Король говорит (название фильма)
Say to - сказать кому-то что-то.
He said to me that was a student. Он сказал мне, что он студент.
tell - сказать что-то.; велеть кому-то; рассказать что-то.
She tells that she will come soon. Она говорит, что скоро придет.
He told me to sit down. Он велел мне сесть.
She always tells fairy-tales to children. Она всегда рассказывает сказки детям.
1) If I am here I will help you.
If I was here I would help you.
If I had been here, I would have helped you.
2) If it is possible we will begin this work at once.
If it was possible we would begin this work at once.
If it had been possible, we would have begun this work at once.
3) If she has all the necessary books she will make her report in time.
If she had all the necessary books she would make her report in time.
If she had had all the necessary books, she would have made her report in time.
Подставьте выражения рядом с правильной формой слов в скобках
Can you tell me where are the dictionaries