Is this sentence correct? (Explain)
Yes it is! Some time clauses can be used with present perfect simple to refer to the future.
What one word can you add to this sentence to make it correct?
I haven't seen Charles SINCE last week.
Is this sentence correct? (Explain)
No it isn't. You can't use present perfect in a finished period of time.
How can you change the tense of this sentence to stress the duration?
By using present perfect continuous: "He's been playing video games all day".
Is this sentence correct? (Explain)
Yes it is! With present perfect continuous, you may hear people using stative verbs in continuous form.
Why is sentence A. correct, but sentence B. incorrect?
In sentence A "have" is an event. In sentence B "have" is a state and therefore not normally used in continuous form.
Is this sentence correct? (Explain)
Yes it is! The past perfect is used here to explain what had occurred before the present perfect.
Which event happened first?
Karaoke
The Roman Empire.
The times I'd gone before.
Travelling to Australia.
Express the information in a single sentence using a perfect tense.
eg: "By 2030, we'll have been living in the new house for ten years".
Express the information in a single sentence using a perfect tense.
eg: "I'll have finished university by 2030".
Express the information in a single sentence using a perfect tense.
"I'd never seen a whale before yesterday's boat trip".
Form a sentence using a perfect tense inspired by this incredible video.
eg: "He's just had a crash in a toy car!"
