These questions are the most difficult, simply because there's no way to tell they are questions without the question mark.

The Question

When we right a yes/no question in Sindarin, simply write a normal statement and add a question mark.
Example:
Are the leaves green in Lothlórien? - Literally: The leaves are green in Lothlórien? - I laiss celin mi Lothlórien?
Did the soldier betray us? - Literally: The soldier betrayed us? - I naug ven gweriant?

The Answer

This is the part a lot of people have trouble with because the words "yes" and "no" do not exist in Sindarin. When answering this question "yes", you simply repeat the question with first person pronouns switching with the second person pronouns, getting rid of the question mark. When answering this question "no", simply repeat the question using the opposite negation.
Example:
Did you kill my father? - Literally: You killed my father? - Dengich adar nîn?
Yes. - Literally: I killed your father. - Dengin adar gîn.
No. - Literally: I didn't kill your father. - Av-nengin adar gîn.

Homework

Symbols that you may need:
áéíóúý
ÁÉÍÓÚÝ
âêîôûŷ
ÂÊÎÔÛŶ

This will be like the homework before: translate the questions into Sindarin or English, then answer them. You don't need to answer them truthfully, but the answers have to make sense. Again, there's no word bank, you need to use the dictionary.

Melich lembas? - Do you like lembas?
I merilin linnar? - Are the birds singing?
Do you live in a tree? - Dorthal mi ‘aladh?
Is the day sunny? - I aur nórui?