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Much everyday L2 (& L1) usage entails narrating past experience ~ one's own or others' ~ and discussing, denying, enquiring about it. In common with many languages, English has a range of tense formations to distinguish and layer elements in past narrative, including for one-off or continuous events and for those either one or more steps back into the past ('I knew what to do when she suddenly collapsed, since we had been doing First Aid at college a week or two earlier'). Many of these formations are 'logical' extensions of one another (e.g. 'Today I have finished after 90 minutes, but yesterday I HAD finished by 10 o'clock'), but there is a range of 'strong verbs' ~ often for quite common ideas ~ whose past forms need learning separately as they do not follow the default rule. Many of these entail a vowel-shift kindred to what happens in German, for instance (swim/swam/swum) and these are better learnt in groups by such vowel-shift (drink/drank/drunk) than in a huge, arbitrary, mixed alphabetical slab of 200-'odd' verbs. Fortunately past experience lends itself readily to classroom games such as mime, spot-the-difference (before & after) etc.