Решение:
Заполним пропуски, указав паст-партицип (причастие прошедшего времени) для каждого глагола. Отметим, какие из них являются неправильными (irregular).
- arrive - arrived (regular)
- be - been (irregular)
- buy - bought (irregular)
- come - come (irregular)
- eat - eaten (irregular)
- fly - flown (irregular)
- get - gotten/got (irregular)
- go - gone (irregular)
- have - had (irregular)
- keep - kept (irregular)
- leave - left (irregular)
- lose - lost (irregular)
- meet - met (irregular)
- stay - stayed (regular)
- put - put (irregular)
- return - returned (regular)
- ride - ridden (irregular)
- see - seen (irregular)
- take - taken (irregular)
- tell - told (irregular)
- travel - traveled/travelled (regular)
- try - tried (regular)
Ответ: Неправильные глаголы: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 17, 18, 19, 20.