Unit 4

1. We can use already in affirmative sentences in the present perfect.

   • Example: I have already been at sea for four days.

2. We can use yet in negative sentences in the present perfect

   • Example: They have not found turtles yet.

     3. We can use just with the present perfect to say that something happened very recently

   • Example: We have just seen dilphins.

1. We can use for with a period of time such as a week, two months, or five years.

   • Example: I have been here for three days.

2. We can use since with a specific date or time.

   • Example: They have been here since last Wednesday

https://youtu.be/wEI_O8Ugid0

https://youtu.be/tNgOWWpUokc

https://youtu.be/BTUucIlJp9k