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I have doubt regarding these type of sentences:

1. The changes are to be updated.
VS
2. The changes have to be updated.

1. The website is to be tested on all browsers.
Vs
1. The website has to be tested on all browsers.

Theses are also written simply by using should be

The website should be tested on all browsers.

I am confused about above sentences. What do they mean? What is the meaning if has/have is used am/is/are instead.
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harry1999The changes have to be updated. ...
The website has to be tested on all browsers.
One meaning: must.

These have to do with a requirement, an obligation, and they mean:
The changes must be updated. (Someone must update the changes.)
The websites must be tested on all browsers. (Someone must test the websites on all browsers.)
harry1999The changes are to be updated. ...
The website is to be tested on all browsers.
Two meanings: must; will

The first meaning is the same as shown above:
The changes must be updated. (Someone must update the changes.)
The websites must be tested on all browsers. (Someone must test the websites on all browsers.)

The second meaning is different, and it has a little of the sense of being ready:
The changes will be updated. (Someone is going to update them; they are ready to be updated.)

The website will be tested on all browsers. (Someone is going to test it; it is ready to be tested.)
harry1999also written simply by using should be
[ The changes should be updated.
The website should be tested on all browsers. ]Two meanings: advisable; expected

The first meaning makes the claim that it would be wise to do these things:

It is advisable that the changes be updated.
It is advisable that the website be tested on all browsers.

The second meaning makes the claim that these these things are expected to happen:
It is expected that the changes will be updated.

It is expected that the website will be tested on all browsers.

CJ
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Hi,

A small further comment about this.

1. The changes are to be updated.
VS
2. The changes have to be updated.

It's not really good English to 'update changes'.
Here are better ways to say it.

You apply or make changes to something.
Ypu update something by applying or making changes.
You make updates to something.

Clive
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Comments  
[ Verb to be + to ] is a higher order of instruction in my opinion.
" You are to / must follow the rules while you are staying here. " This says " no ifs, buts, and exceptions".

" You have to follow the rules while you stay here". The bulk meaning is still the same but the tone is less commanding.
 CalifJim's reply was promoted to an answer.
Thanks, It is really really helpful. My doubts are cleared. Yuppy!
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Thanks Really helpful!
 Clive's reply was promoted to an answer.