Gosh, I can't tell you the rule, but I can tell you the difference in the meanings from a colloquial understanding, how I would understand it if we were having coffee

1. Before my parents come, I will have cleaned my house.

2.I will be cleaning my house before my parents come.

In the test i confuse in which brackets put future perfect or continuous?

Could you tell me the key worson these tenses!

Thanks.

1 - The house will be clean when they arrive. Your parents are coming. Before they arrive, you will clean your house. Your house will be clean. When did you clean the house? Yesterday? Last week? This morning? - Hmmmm - doesn't really matter. What matters is that your house is clean. When your parents walk in that door, your house will be clean. What's most important is the outcome. The house is clean.

2- You are going to spend time cleaning your house. I will be cleaning my house - it's important that cleaning will occur. Yes, the result is that the house will be cleaner, but will it be completely clean? You will have done some cleaning, but God only knows if it will be clean enough to make your parents happy. When will you clean it? Although the sentence doesn't say exactly, from a coloquial position it seems like you will be cleaning it right before they arrive. You will clean the house in the morning and they will be arriving that afternoon.

As a native speaker I can't help with the rules. And I could be wrong. But that's what it would mean if I were having a conversation with someone.

Good Luck on your test.

Laurie

I don't know if this is helpful but here are the two tenses:

1. Before my parents come, I will have cleaned my house.

"will have cleaned" is the FUTURE PERFECT TENSE and it indicates that an action will have been completed (finished or "perfected") at some point in the future. This tense is formed with "will" plus "have" plus the past participle of the verb (which can be either regular or irregular in form): "I will have spent all my money by this time next year.

2. I will be cleaning my house before my parents come.

'will be cleaning" is the FUTURE PROGRESSIVE/CONTINUOUS TENSE and indicates an action that will occur over a period of time at some point in the future. The future progressive expresses events that will last for a duration of time at some point in the future. It is also called the future continuous tense.

Both sentences are correct and in the end they basically mean the same actions and sequence. First there is cleaning, and some time after that the parents come. The first sentence emphasizes the completed action and the second emphasizes the process.

The second sentence sounds awkward without the contraction I’ll, especially in informal use which this sentence is more likely to be. It sounds more informal than the first sentence and would be more likely to be said as in something like “You can bet I’ll be cleaning my house before my parents come.” In other words your house is a mess and you’ll clean it before they see it that way.

For a hopefully not too confusing bonus, the first sentence has the sequence I will have which can be written with the contraction I’ll , but in casual speech the pause after I’ll and the h sound are often elided as if there were two contractions something like I’ll’ve. That is not correct in written form though.

Also I can’t tell what “worson” was meant to be.

First sentence. It means, you cleaned your home, and after that, your parents came. First action: to clean a home, and second action: your parents come. Before my parents came(past simple), I have cleaned my house(present perfect).

Second sentence. It means a process. You are cleaning a home, and your parents come in at this moment.

Before my parents came, I had cleaning my house at that moment.

I think, it need more information about this exercises and task.