'They love it' or 'They are loving it'?
When a verb describes a state and not an action we do not use the continuous tense. For example, 'play' is an action so we can say 'playing' whereas 'be' is a fixed state which does not change: 'To be, or not to be'.
'Fight / fought / fought'
Most English verbs take -ed for the past tense or past participle. The problem is that many verbs do not follow this rule. Here is a good list of irregular verbs for you to refer to.
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