Irregular verbs MEDIUM 1(10)

Build: [blank_start]built[blank_end], [blank_start]built[blank_end]

Buy: [blank_start]bought[blank_end], [blank_start]bought[blank_end]

Learn: [blank_start]learnt[blank_end], [blank_start]learnt[blank_end]

Know: [blank_start]knew[blank_end], [blank_start]known[blank_end]

Keep: [blank_start]kept[blank_end], [blank_start]kept[blank_end]

Hit: [blank_start]hit[blank_end], [blank_start]hit[blank_end]

Hear: [blank_start]heard[blank_end], [blank_start]heard[blank_end]

Forgive: [blank_start]forgave[blank_end], [blank_start]forgiven[blank_end]

Forget: [blank_start]forgot[blank_end], [blank_start]forgotten[blank_end]

Fly: [blank_start]flew[blank_end], [blank_start]flown[blank_end]