The adjective in front of the noun: when -e and when -en
CEFR A2 · part 2
edumaterial's parts within the level. The European framework does not subdivide them.
weil and dass: the clause where the verb goes to the endJoining two clauses with weil, dass, wenn or ob and sending the conjugated verb to the…in, auf, an…: the nine that take two cases depending on wo or wohinChoosing the case with a single question: if the sentence answers wohin —where to, there…war, hatte, konnte: the past tense people do say out loudUsing in the past the eight verbs a German never puts into the Perfekt when speaking…The imperative and German's three «you»: du, ihr, SieGiving an instruction to the three people German lets you address, and knowing which is…Comparing in German: -er, als, and am -stenComparing two things and pointing out the top one, with German's three pieces: the -er…mich or mir, dich or dir: pronouns in the accusative and dativeReplacing anything already mentioned with a pronoun, in both cases, and placing it…The rule, in three lines
An adjective is only declined when it stands IN FRONT of the noun. After the verb it goes bare: Das Haus ist groß. In front it takes an ending: das große Haus. The short rule that covers most of it: after der, die, das in the nominative the ending is -e; in nearly everything else it is -en. The remaining exceptions are the neuter and feminine accusative, which also give -e.
The usual slip. Declining the adjective when it comes after the verb: Das Haus ist großes. In German it takes nothing there, ever. And the second mistake is the opposite: leaving it bare in front, das groß Haus. Both come from the same place, from assuming agreement works the same in both positions, and in German it does not.
Why it catches you out. English adjectives never change at all, so there is nothing to unlearn after the verb —«the house is big» is already German—. The whole difficulty is the opposite one: producing an ending where you have never produced any. The upside is that the commonest ending by far is -en, so when in doubt it is the better bet.