"Advise" + (sb) + that-clause

[NAL123]

1) They're advising that children (should) be kept at home.

2) His lawyer advised him that he (should) plead guilty.

Q1: Are these sentences correct? (with and without "should")

[GoesStation]

They're okay with "should". Number one works for me without it, but number two doesn't. I don't know why!

[NAL123]

They're okay with "should". Number one works for me without it, but number two doesn't. I don't know why!

OK. Do the following work for you without "should"?

3) Experts advise that you should avoid being in strong sunlight for long periods
4) Doctors advised that he should be transferred to a private room.
5) Experts advise that sunscreen should be reapplied on an hourly basis.
6) The bank advised us that we should increase our insurance cover.

[GoesStation]

OK. Do the following work for you without "should"?

3) Experts advise that you should avoid being in strong sunlight for long periods
4) Doctors advised that he should be transferred to a private room.
5) Experts advise that sunscreen should be reapplied on an hourly basis.
6) The bank advised us that we should increase our insurance cover.

One through five work without it. Six doesn't. Now I can see that it's the transitive use of "advise" that requires the modal.

[jutfrank]

I'll give a different answer from GoesStation:

1) Delete should. There's no need for it. You're talking about a specific state-of-affairs, so advise that + clause is appropriate.

They're advising that children be kept at home.

2) Again, delete should. You're talking about a specific course of action, so use advise someone to do something.

His lawyer advised him to plead guilty.

I suggest you do not use advise someone that ...