Posted by Grant Richardson, 9th February, 2016
By intermediate level, students normally learn several grammar rules that require past participle verbs (eaten, given, seen, known, taken, …):
A simple reminder for all these rules is:
Any time you use ‘have’ or ‘had’ followed by another verb, use the past participle form of the verb (not past simple form).
E.g. Use “have taken” (or “had taken“), and never “have took” (or “had took“).