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Hello, could you explain the following grammar construction...

The project to be done.
To be continue.
... 

And what's the difference between next sentence:

The project has to be done. 
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Valent1neThe project to be done.
To be continued.
These are passive infinitives. They are analogous to ordinary passive sentences, but just the infinitive form.

Someone completed the project. (active)
The project was completed by someone. (passive)

Likewise:

Someone has to do the project. (active infinitive)
The project has to be done by someone (passive infinitive)

Or:

Someone can do the project. (active - modal with bare active infinitive)
The project can be done by someone. (passive - modal with bare passive infinitive)

And:

We have someone to do the project. (active infinitive)
We have a project to be done by someone. (passive infinitive)
_______

(In all the passive structures above, you can omit by someone. It's understood anyway.)

CJ
Comments  
Valent1neThe project to be done.
This is a noun phrase. It means the project that the project that has or had to be done, or that is or was going to be done.

The next project to be done was paving the parking lots.
The men will have to work overtime for the project to be done on time.
The project to be done was dangerous, expensive, and unnecessary.

The last is a awkward. It sounds better to say;
The project they had to do was dangerous, expensive, and unnecessary.
Valent1neTo be continue.
This is not English. It's a mistake.

At the end of an episode of a television program or a chapter of a book, you might see the words To be continued. That means that the story is not over and will be continued in the next episode or the next chapter.
Valent1neThe project has to be
done. .

Oops! You forget the other sentence.

The Linguist

Site Hint: Check out our list of pronunciation videos.
Oops, again.

Even native speakers make mistakes.

I should have said, "You forgot...."

TL
 CalifJim's reply was promoted to an answer.
Thanks
Students: We have free audio pronunciation exercises.

The messages were written approximately 10 years ago. Emotion: smile and have you learnt the differences ? If not I will write.

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The messages were written approximately 10 years ago. and have you learnt the differences ? If not I will write.

Valent1ne has not been active on this forum since Feb 19, 2011. It's probably not worth your while to reply.

But if you reply to a more recent post there's a better chance that the person who asked the question is still participating on our forum and can benefit from your answer.

CJ