Present perfect and present perfect continuous

[ali]

Test No. errors/inter-8 "Tenses", question 1

I have learn many things in my class today and now I can do my homework without any problems.

(a) learn
(b) things
(c) do
(d) any

Test No. errors/inter-8 "Tenses", answer 1

I have learned (learnt) many things in my class today and now I can do my homework without any problems.

Correct entry: learned (learnt)
The error was: (a) learn
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i would like explanation of present perfect and present perfect continuos.thanks

[Torsten]

OK,

Maybe we should take this one step at a time. Let's start with the structure of the Present Perfect:

subject + auxiliary verb (form of have) + main verb (past participle)

Example:
I have sent you an email.

We use the present perfect if we want to make connection between an action that happened in the past and the present situation. (writing the email happened in the past while the result relates to the present).
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