Do/ does/ did (you/ it)...? Hovoríš anglicky? (Do you speak English?) Verb goes first. In most cases you don`t need to change anything, just use intonation.
May (I)...? Môžem /Smiem....?
Can (I)...? Môžem...? (the same as previous)
Could (you)...? Mohol by si...?
If...? Here I am not sure what question you want to ask...
Is/ are there...? Je tu/Sú tu...?
Is it/ Are they...? Je to/Sú to...?
kto, čo, ked', kde je (pronounced "gde je"), prečo a ako, kedy (when)
Hope it helps