Take some keys with you – I'll probably be ________ a shower when you get back.

We generally use by/in with the future continuous and by/in with the future perfect.

Please, come at 8. By that time, I ______ my homework and we can go out. [ 'll be finishing ] [ 'll have finished ]

I'm taking the day off on Friday – I ______ be working.

In less than 2 years, my grandparents _______ for 50 years. We are going to celebrate it. [ will have been married ] [ will be getting married ]

Next week we'll ________ been together for two years.

We form future continuous with - will + be + present/past participle.

By June next year, I _______ have retired from work.

There won't be anyone in the office. Everyone _____________ (go) home.

Don't phone me before 8 o'clock, we ___________ (have) dinner.

Julie _____________ (not work) this time next week. She'll be on holiday!

When I travel to England next year I ________ English for over four years, so I think I'll be ready. [ will be studying ] [ will have studied ]