Present Perfect

Article excerpt · target grammar marked

Aaron Davis has spent over twenty years studying wild coffee plants. In 2018, his team has found a rare species. Scientists have already predicted that half of arabica's farmland could vanish by 2050.

Grammar Reference · Present Perfect

Form

She has worked here for ten years. — have/has + past participle

Experience

I have tried stenophylla coffee. — life experience, no specific time

Unfinished time

He has lived in Sierra Leone since 2015. — started past, continues now

Common error

I have gone there yesterday ✗ → I went there yesterday ✓ — specific time = past simple

01Exercise 1 — Form · Write the Correct Form

Present Perfect

1.She (work) at Kew Gardens for many years.

2.They (not find) any wild coffee yet this trip.

3. you ever ... (taste) rare coffee?

4.He (already / test) the new plant's flavour.

5.We (just / hear) some exciting news about coffee.

6.Farmers (start) growing the plant again since 2021.

02Exercise 2 — Transform

rewrite with the new structure

1.Davis started studying coffee twenty years ago. He still studies it.

2.The team found the plant. This happened in 2018.

3.Nobody saw this plant. This lasted for sixty years, until now.

4.Researchers tested the flavour. It was a completed action in 2021.

5.Farmers began growing stenophylla again. This started recently and continues.

03Exercise 3 — About You

in your notebook

Personalise: complete five sentences about yourself using the target grammar.

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