Present perfect and past perfcet continuous

The present and past perfect continuous are also known as a...

• present and past perfect progressive

• using -ing

• both use been

• both use verbs

when do we use present perfect continous

• to talk about action that started in the past and finished

• to talk about action that is happening right now

• to talk about action that started in the past and is continuing now.

• to talk about action that started in the present.

When do we use past perfect continuous?

• when an action or event was happening for a period of time

• when an action or event is happeningfor a period of time until (or just before)

  another action, event, or time

• when an action or event is happening for a period of time

• when an action or event was happening for a period of time until (or just before)

  another action, event, or time

what is a example of present perfect continuous?

• We have watching tv since 3 hours

• We have been watching tv all day

• We have been watch tv all day

• We have watching tv all day

what is an example of past perfect continuous?

• I has been buying cat food in a physical shop for one year until I descovered to buy it online. 

• I had buying cat food in a physical shop for one year until I descovered to buy it online. 

• I had been buying cat food in a physical shop for one year until I descovered to buy it online. 

• I had been buy cat food in a physical shop for one year until I descovered to buy it online. 

What is the positive structure for present perfect continous?

what is the negative structure for present perfect continous?

what is the question form for present perfect continuous?

write a positive sentence using present perfect continous

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whar are the expressions that we can use in present perfect continuous?

• all day, for, since, the whole week, etc.

• I don't know :(

• since and for

• V-ing