We use 'since' with a point in time in the past (12th May, last week, ...)

We use 'for' with a period of time which continues until now (twenty years, ages,...)

Answers 'a' and 'b' are correct

We can not use 'for' or 'since' with Present Perfect

With the verb 'HAVE' and the Past Participle of a verb

In the 3rd person singular (he/she/it) we must use the auxiliary 'HAS'

In negative sentences we just add the auxiliary verb 'HAVE NOT' (haven't) or 'HAS NOT' (hasn't) in the 3rd person singular (he/she/it)

Answers 'a', 'b', and 'c' are correct

To describe a past event which happens before another event in the past: 'When Stella arrived to the theatre, the concert had already started'

To speak about an action happening at the time of speaking

To talk about future events

To express your routines and habits

He had call the police

She hadn't tried fish and chips before

Had you told the news to your family?

Had it started snowing yet?

hadn't finished, lost

have finish, losed

didn't finish, had lost

had not finish, lose

Funnyer than, niecer, the most frightening, badder than

Funnier than, nicer than, more frightening than, worse than

The most funny, the nicer, more frightening than, the worse

The funniest, the nicest, the most frightening, worse than

the good

the better than

the best

the goodest

Enviar, destinatario, siguiente, asignatura y archivar

Correo basura, remitente, eliminar, sujeto y adjuntar

Responder, recibir, adjuntar, sujetar y remitente

Responder, reenviar, eliminar, asunto y adjuntos

'Yours sincerely', 'Yours faithfully', 'Yours truly'

'Cheers', 'See you soon', 'Bye for now'

'Regards', 'Kisses', 'Goodbye'

'Hello', 'Dear Mr. Thompson', 'See you tomorrow'

An informal email

A formal email

It does not matter

Answers 'a' and 'b' are both correct

To give advice

To talk about imaginary or future situations

To express unreal situations in the past and their unreal past results

To speak about general facts of scientific facts. For example: 'If you don't water plants and flowers, they die' or 'If you heat water at 100ºC, it boils'

Would pass

Passed

Will pass

Has passed

Had, would go

Had had, would gone

Have, went

Had, will go

Expresses an imaginary present situation

Describes what the speaker thinks would have happened as a consequence of a situation which is in the past, so it is impossible to change

Isn't used in English

Is a combination of 1st and 2nd Conditional

Organization and planning skills

Being tolerant about stress situations and overworking

Answers 'a' and 'b' are both correct

Inappropriate behaviour

I have lived here since the 24th June

I've worked here since last week

They've been married for 50 years

Sheila has studied English since 4 years

'Regards', 'Bye for now', 'See you later'

'Hi there', 'Hello again', 'Good morning Tim'

'Dear Sir or Madam', 'Dear Mr. Piper'

'Yours faithfully', 'Yours truly'

ever

just

already

yet

the smartest

the more smart

more smartest

the most smartest

I did not have any money because I had leaved my wallet at home.

I had already fallen asleep before ten o'clock

Molly had wanted a guitar, but she received a book

My sister had already cooked lunch when I got home

EAT: eaten

WRITE: written

ENJOY: enjoyed

BRING: bringed

Have hitted

Have / has hit

Have / has hitted

Had hit