ответьте на вопрос.Почему при решении задач возникает необходимость составлять уравнение?

звуко-буквенный разбор слова СГРЫЗ

В каком слове надо заменить букву «з» на букву «с», чтобы превратить снег в дождь?

Use the Present Perfect Tense.

1. He gets up at 6 a. m. (just)
2. We translate English texts every week, (already)
3. I see her every day. (today)
4. They pass the exams every year, (already)
5. I know him very well, (since 2000)
B. Use the Past Perfect Tense.
1. They finished their experiment, (by 5 o'clock)
2. She typed the letter, (by the time we returned)
3. He looked through the documents, (by 12 o'clock)
4. He had supper at 8 o'clock, (by that time)
C. Use the Future Perfect Tense.
1. I'll make dinner tomorrow, (by the time my husband comes)
2. They will build the shop next year, (before we move there)
3. We are packing the things, (by the time the taxi comes)
4. They will pass the exams in June, (by July)