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not ... yet (for things which have not happened so far)
Peter hasn't phoned yet. I'm still waiting.
for and since
We use for with a length of time: She's worked here for ten years.
We use since with a point of time to describe when the period of time began: They've
lived here since 2001.
been and gone
A number of astronauts have been to the Moon (and have returned).
The space probe Voyager has gone past the planet Neptune (it hasn't returned).
EXERCISES
1. Complete the sentence using a verb from the list in present perfect simple
form.
collect, put up, install, recycle, organize, replace, paint, send, plant, show
What we have done to make our school a greener place?
a. We have sent
information leaflets to all parents.
b. We ________________information posters in every classroom.
c. We _________________ over five tones of litter for recycling.
d. We ______________________fifteen trees in front of the schoo1.
e. We ______________________ 50 light bulbs with energy-saving bulbs.
f .We _______________________ 25 ink cartridges from computer printers.
g We _______________________ three films about how to save energy .
h. We _______________________ signs on all the doors reminding people to turn
off the lights.
i. We _______________________ five new energy-saving heaters.
j. We _______________________ teams of students to turn off unused lights.
2.
Use the prompts to make a question.
a. you / ever / see a humming bird? Have you ever seen a humming bird?
It's the world smallest bird.
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