"They are very strong substances."
Translation:Son sustancias muy fuertes.
is 'fuertes' one of those adjectives that doesn't need to agree with the noun it modifies?
In the test out to level 4 the exercise given was “ellas son sustancias muy fuertes” now in the test out to level 5 the exercise is reversed and it’s incorrect to use ellas. That’s just irresponsible and damned stupid and cost me a heart.
Can someone please tell me when do we use pronouns and when can we eliminate them. I seem to always choose the wrong way I put Ellos sustancias muy fuerte. Which is correct but I got dinged because I used the Ellos. Even if it is redundant it should still be correct. Right?