Tips and common mistakes for composition and modulation?

[ren]

a.k.a. Question 3 in the Grade 6 ABRSM paper.

I'm almost clueless about this part.

Basically, I get the outline of the exercise - phrasing appropriately, modulating to the right key, but there are pretty wide gaps in my understanding of doing it. I just need to find out what I really, really need to avoid.

To give you a clearer idea of what I'm talking about, a sample of such a question is attached.

q3abrsm.jpeg

Any useful help would be greatly appreciated.

[johnjohnsonsfsd]

This is just a quick suggestion but since the Haydn is arpeggiating a chord in D Major why not just write a few more bars that do the same type of arpeggios but built on other diatonic steps of the key. i.e. Eminor, F#minor, G Major, A Dominant etc...

[Jason13]

Your tips help me a lot.Thanks