I was going to put "I would like a new car," but I saw that it defined "ein neues" as "another," so that's what I put, and it was marked as incorrect...
Why 'einen neuen' in one and 'ein neues' in the other? 'Hast du einen neuen Freund¿' & 'Ich möchte ein neues Auto'.
It depends on the word you are describing. Freund is masculine word (der Freund) and Auto is a neuter noun (das Auto). Adjectives describing masculine and neuter nouns have different endings.
It's called "Mixed inflection":
Du hast einen blauen Mantel. - you have a blue coat
Wir haben kein schwarzes Bier.
Ich brauche eine englische Zeitung.
All three examples are the akkusativ case, for masculine (first example), you have both with the -en ending, but for neuter (second example), just the adjective gets declined, and for the feminine, both are with the -e ending.
Das Bier = ich möchte ein schwarzes (better: ein dunk(e)les) Bier. Der Hengst (stallion) = ich möchte einen schwarzen Hengst. Die Vase = ich möchte eine schwarze Vase.
Instead of "schwarzes Bier" you can also say "Schwarzbier". "Weißbier" is the same as "Weizenbier" (made by using wheat).
In the conjugation tab, it shows "möchte" as past conditional, not present conditional, which is shown as "möge". I would have thought that "I would like" is a present conditional, is it not? And that "Ich möchte", the past conditional would be "I would have liked"
Yes, but i guess that, just like in spanish and portuguese, the past condicional has a meaning of a present desire here.
But "I want a new car" is also an acceptable answer, and that is definitely not past tense. So how is "möchte" correct here ?
"möchte" is not past tense but subjunktive, like "would like", "would take", "would buy". It is more common to say: "Ich möchte ein neues Auto" than "Ich will ein neues Auto". The last one sounds as a command.
So it's ein neues Auto but in the last section, I put ein interessante Woche and it was supposed to be eine interessante Woche. So is ein for only male and neuter nouns?
Ja, ein neues Auto, but eine neue Hose (trousers), mein, dein, sein, ihr neues Auto, but meine, deine, seine, ihre neue Hose. But: die neue Hose and das neue Auto (not neues).