Practise forming past participles. Regular verbs end in ge-…-t (gemacht), irregular verbs in ge-…-en (geschrieben). Separable verbs put ge- after the prefix (eingekauft); verbs with be-, ver-, er- and verbs ending in -ieren have no ge- (bekommen, studiert).
machen is a regular verb.
schreiben is an irregular verb.
gehen is irregular – its participle ends in -en.
Look at the prefix ver-.
anfangen is separable, and fangen is irregular.
Verbs ending in -ieren are special.
bringen changes its stem but ends in -t.
Look at the prefix be-.
einkaufen is separable. Where does ge- go?
The stem of warten ends in -t.