Another question

[MaliciousHUT]

Heat energy may be absorbed or realeased when ..... while work is done on or by the system
A)changes in the internal energy of a system
B)by changing the internal energy of a system
C)the internal energy of a system that changes
D)the internal energy of a system changes

I chose C)
IMHO, D is not correct since we'll have two verbs : "changes and "is"?
? do you think?

[nnphuoc]

Originally posted by MaliciousHUT

Heat energy may be absorbed or realeased when ..... while work is done on or by the system
A)changes in the internal energy of a system
B)by changing the internal energy of a system
C)the internal energy of a system that changes
D)the internal energy of a system changes

I chose C)
IMHO, D is not correct since we'll have two verbs : "changes and "is"?
What do you think?

I am afraid that you are wrong. D is the answer. After while/when, we need a clause not a phrase.

HTH
Phuoc

[MaliciousHUT]

thanks A.Phuoc

Anyway, I read this sentence like this:
Heat energy may be absorbed or realeased when the internal energy of a system [that changes
while work] is done on or by the system

Does it make sense?

[nnphuoc]

Originally posted by MaliciousHUT

thanks A.Phuoc

Anyway, I read this sentence like this:
Heat energy may be absorbed or realeased when the internal energy of a system [that changes
while work] is done on or by the system

Does it make sense?

NO. If you want this sentence to read like this, it should be:

Heat energy may be absorbed or realeased when the internal energy of a system [that changes
while work working] is done on or by the system.

HTH
Phuoc

[MaliciousHUT]

I get it, thanks !