Can you help me correct bitte

[nimble axle]

1st picture, #4: Singular and Plural of "Onkel" are the same, which means that "Onkel" could be singular or plural here.

But the fact that 1) You said "meine Onkel" earlier (my uncles) and 2) you talk about "Tanten" (aunts) suggests that you probably are supposed to assume that "Onkel" is plural here, as well.

So you need to change the endings to match it being plural instead of singular.

1st picture, #8 translate that sentence into your native language and work through the logic carefully.

2nd picture: I don't understand the last line of the instructions: "Bitte beachten Sie, dass diese Nomen im Akkusativ stehen"

Except then in the examples, the nouns aren't in accusative case? What's that about?