Present Perfect, Past Simple y Present Perfect Continuous
PRESENT PERFECT: I have lost my keys (already, just, yet, since, for ever, never)
PAST SIMPLE: I lost my keys (yesterday, last week, two months ago)
PRESENT PERFECT SIMPLE: I have lived in New York. / She has lived in NY.
PRESENT PERFECT CONTINUOUS: I have been waiting for you for... / She has been waiting for two hours.
Tag Questions (Preguntas de Cola)
1. TO BE
You are tired, aren't you?
You aren't tired, are you?
2. HAVE GOT
You have got three brothers, don't you?
You haven't got two brothers, do you?
3. PRESENT SIMPLE
They eat a lot of fruit, don't they?
They don't eat a lot of fruit, do they?
She doesn't have a dog, does she?
4. PAST SIMPLE
You broke your leg, didn't you?
You didn't break your leg,
...