| U |  | | unbend | | | 過去 unbent, unbended | | | 過分 unbent, unbended | | |
| | | unbind | | | 過去 unbound | | | 過分 unbound | | |
| | | underbid | | | 過去 underbid | | | 過分 underbidden, underbid | | |
| | |  undercut | | | 過去 undercut | | | 過分 undercut | | |
| | |  undergo | | | 過去 underwent | | | 過分 undergone | | |
| | | underlay | | | 過去 underlaid | | | 過分 underlaid | | |
| | | underlie | | | 過去 underlay | | | 過分 underlain | | |
| | | underpay | | | 過去 underpaid | | | 過分 underpaid | | |
| | | undersell | | | 過去 undersold | | | 過分 undersold | | |
| | | undershoot | | | 過去 undershot | | | 過分 undershot | | |
| | |  understand | | | 過去 understood | | | 過分 understood | | |
| | | undertake | | | 過去 undertook | | | 過分 undertaken | | |
| | | underwrite | | | 過去 underwrote | | | 過分 underwritten | | |
| | | undo | | | 過去 undid | | | 過分 undone | | |
| | | undraw | | | 過去 undrew | | | 過分 undrawn | | |
| | | ungird | | | 過去 ungirded, ungirt | | | 過分 ungirded, ungirt | | |
| | | unlearn | | | 過去 unlearned, unlearnt | | | 過分 unlearned, unlearnt | | |
| | | unmake | | | 過去 unmade | | | 過分 unmade | | |
| | | unsay | | | 過去 unsaid | | | 過分 unsaid | | |
| | | unstick | | | 過去 unstuck | | | 過分 unstuck | | |
| | | unstring | | | 過去 unstrung | | | 過分 unstrung | | |
| | | unwind | | | 過去 unwound | | | 過分 unwound | | |
| | | uphold | | | 過去 upheld | | | 過分 upheld | | |
| | | uprise | | | 過去 uprose | | | 過分 uprisen | | |
| | | upset | | | 過去 upset | | | 過分 upset | | |
| | | upsweep | | | 過去 upswept | | | 過分 upswept | | |
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