Arabic verb form: tafa''ala/V Question & a little info.

[unknownuser]

Peace,

In my Arabic text book it has nice explanations of meaning patterns;

Some for the benefit of those who might be interested are

A form II verb may signify

i) Causation 3aLiMe; He knew ? 3aLLeMa; He caused s.o to know i.e taught.
ii) Intensity of action KaTeLe; He killed ? KaTTeLe; He massacred.
iii) Estimation SaDeKa; He spoke the truth?SaDDeKa; He considered s.o truthful or He believed.

A form IV verb generally signifies causation.

For example DeKhaLe (I) he entered, becomes he admitted you add a sukuun on the first letter, prefix with an alif with a hamzatul qat on the top and a fathah (e) probably the phonetics being 3ADKhaLe.

My question
My book does not give a meaning pattern for form V or tafa''ala, what is the meaning pattern for this word? For example, he taught becomes, he learnt. 'ALLeMa>>Ta'ALLeMa

Secondly, is TuBaYyiNa in 3187, 1644, 1664 in this form? What is the effect of the dammah, why is it there?

thanks for any help.

regards