Лингвистика

Английский язык. Тест на грамматику.

Помогите решить, и почему в прошедшем времени пишут окончание s, а не ed. Учительница зачёркивала мне прошедшее время с написанным ed. Не могу понять.
1. We went to france last summer.
2.I always have toast for breakfast
3.Does your brother play the guitar?
4.She was reading at 7 o'clock yesterday.
5.They're watching TV at the moment
6.She speaks English
7.What will you do tomorrow?
8.We flew to Rome and then....
9.She is ill
10.When Rick came into the room Jane was eating sandwich
11.They didn't have pizza. They had the pasta
12.Who is your favorite sportsman?
13.How often do you go to the cinema?
14.This is an interesting book. Have you read it?
15.I often go shopping at the weekend
16.I often go to the college on foot
17.These shoes aren't mine. Look! They're too small.
18.Are there any biscuits?
19.Paul left work an hour ago
20.How much chocolate do you eat?
21.This is the best film I've ever seen
22.I'm younger than my sister
23.The number after 11 is twelve
24.I usually have a sandwich for luch
25.She answers the phone and talks to visitors. She's a receptionist.
26.The opposite of cheap is expensive
27.The day after Friday is Saturday
28.It's usually hot in summer
29.Bye. Have a nice time
30.We eat in the dining room
31.You shouldn't sit in the sun all day
Если хочешь объяснения то могу дать только к некоторым (я особо не раздумываю и просто рефлекторно выбираю ответ который считаю правильным а толком объяснить не могу) и то не сейчас т. к я тороплюсь кое куда
ММ
Маншук Марсовна Сейилбаева
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