To think of someone

Question

I have been trying to translate this English phrase into Latin properly, and I started to check it in some resources.

In this text it goes: "..., cum de tuis cogitas,...". And I have no idea why there is "cum" there but by the looks of it cogitāre dē + ablative seems to be valid.

Also here it only uses with de + abl, without cum.

So my questions are:

a. Is the correct translation of I am thinking of you in Latin dē tē cōgitō? If not, please indicate me into right direction. Am I using the wrong verb? What am I doing wrong?

b. Why is it used with a cum in Cicero's text? Does that change its meaning?

Answer 1

A: Indeed, de te cogito is a valid construction and supported by the Cicero quote you have.

B: Here cum is not a preposition but a conjunction. It has no effect on how de works.