他的行为有点反常，让人感到奇怪。

tā de xíngwéi yǒudiǎn fǎncháng, ràng rén gǎndào qíguài.

His behavior is a bit unusual, making people feel strange.

孩子们的表现突然变得反常。

háizimen de biǎoxiàn túrán biàn de fǎncháng.

The children's behavior suddenly became abnormal.

他最近的表现令人觉得有点反常。

tā zuìjìn de biǎoxiàn lìngrén juédé yǒudiǎn fǎncháng.

His recent behavior seems a bit abnormal.