bumble的一般过去时怎么拼写？

bumble的音标：bumble的英式发音音标为：['bʌmbl]bumble的美式发音音标为：['bʌmbəl]...

bumble的第三人称单数（三单）为：bumbles...

Mr. Bumble tasted the medicine with a doubtful look.班布尔先生带着疑惑的表情尝了尝这种药.Mr. Bumble's conduct , on being left to himself, was rather inexplicable.班布尔先生独自留下时的举动实在令人费解.Mr Bumble tapped with his cane on the counter sever...

...

bumble的现在完成时为：bumbled...

bumble的现在进行时为：bumbling...