forgotten / must / have / phone / her / at / she / home / .

By the time the teacher arrived, the students ______ (already start) the activity.

This combination of tenses is used to compare a completed action in the past with an action that still has relevance to the present. For example: "I visited Paris last summer, but I haven’t visited Rome yet."

Choose the correct sentence:

This grammar type helps explain ongoing actions or habits in the recent past, focusing on their effect now. For example: "I’ve been feeling tired lately."

after / eaten / left / had / they / they / the / house / .

The door is open. Someone ______ (might / must / can’t) be home.

I ______ (see) that movie three times, but I ______ (watch) it again with my friends last weekend.

They ______ (work) on this project since last Monday.

Fill in the blanks: She ______ (travel) to Hanoi last year, but she ______ (not visit) Ha Long Bay yet.

Fill in the blanks: We ______ (finish) our homework already, so we ______ (watch) TV last night.

This can’t be Jane’s bag. She ______ (must / might / can’t) have left it at home.

He ______ (has been playing / played) football for two hours.