1 We use the past perfect to talk about actions that happened before another action in the past.
2 We use the past simple to describe finished actions or situations in the past, or to say that one thing happened after another.
3 We use the past continuous to talk about activities in progress at a moment in the past, to describe scenes in a story or description, or to talk about an activity in progress in the past that is interrupted by another action.
1c
1 (+) He sat down. (-) He didn't sit down. (?) Did he sit down?
2 (+) He was eating his sandwich. (-) He wasn't eating his sandwich. (?) Was he eating his sandwich?
3 (+) He had eaten his sandwich. (-) He hadn't eaten his sandwich. (?) Had he eaten his sandwich?
2a
1 When I left home this morning, the sun was shining.
2 I caught the bus at 8.45.
3 While I was riding my bike to school this morning, I saw an accident.
4 When we arrived at the station, a lot of people were waiting to buy tickets.
5 She bought her ticket and got on the train.
6 Somebody stole his passport while he was looking for something in his luggage.
7 There was a delay with the plane because it was snowing very hard.
8 As she was leaving the shop, she heard somebody call her name.
2b
While and as usually go with the past continuous.
Объяснение:
1) Мы используем Past Perfect, чтобы говорить о действиях, которые произошли до другого действия в прошлом.
2) Мы используем Past Simple для описания законченных действий или ситуаций в прошлом или для того, чтобы сказать, что одно событие произошло за другим.
3) Мы используем Past Continuous, чтобы говорить о действиях, происходивших в какой-то момент в прошлом, чтобы описывать сцены в рассказе или описании, или чтобы говорить о действиях, происходивших в прошлом, которые были прерваны другим действием.
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Ответ:
1b
1 We use the past perfect to talk about actions that happened before another action in the past.
2 We use the past simple to describe finished actions or situations in the past, or to say that one thing happened after another.
3 We use the past continuous to talk about activities in progress at a moment in the past, to describe scenes in a story or description, or to talk about an activity in progress in the past that is interrupted by another action.
1c
1 (+) He sat down.
(-) He didn't sit down.
(?) Did he sit down?
2 (+) He was eating his sandwich.
(-) He wasn't eating his sandwich.
(?) Was he eating his sandwich?
3 (+) He had eaten his sandwich.
(-) He hadn't eaten his sandwich.
(?) Had he eaten his sandwich?
2a
1 When I left home this morning, the sun was shining.
2 I caught the bus at 8.45.
3 While I was riding my bike to school this morning, I saw an accident.
4 When we arrived at the station, a lot of people were waiting to buy tickets.
5 She bought her ticket and got on the train.
6 Somebody stole his passport while he was looking for something in his luggage.
7 There was a delay with the plane because it was snowing very hard.
8 As she was leaving the shop, she heard somebody call her name.
2b
While and as usually go with the past continuous.
Объяснение:
1) Мы используем Past Perfect, чтобы говорить о действиях, которые произошли до другого действия в прошлом.
2) Мы используем Past Simple для описания законченных действий или ситуаций в прошлом или для того, чтобы сказать, что одно событие произошло за другим.
3) Мы используем Past Continuous, чтобы говорить о действиях, происходивших в какой-то момент в прошлом, чтобы описывать сцены в рассказе или описании, или чтобы говорить о действиях, происходивших в прошлом, которые были прерваны другим действием.