不知怎么的

tā bù zhī zěn me de jiù bǎ shǒu jī diū le.

Somehow, he lost his mobile phone.

In the given context, the speaker emphasizes the unintended or unanticipated event of losing a mobile phone.

jīn tiān wǒ bù zhī zěn me de jiù hěn kāi xīn.

Somehow, I am very happy today.

This sentence shows unexpected happiness the speaker has experienced.

bù zhī zěn me de, tā tū rán zài dà jiē shàng diē dǎo le.

Somehow, she suddenly fell down on the street.

This statement describes an unexpected incident of a person falling on the street.

wǒ men bù zhī zěn me de mí lù le.

Somehow, we got lost.

This statement portrays the unpredicted situation of getting lost.

wǒ bù zhī zěn me de jiù jì zhù le tā de diàn huà hào mǎ.

Somehow, I remembered his phone number.

This signifies a spontaneous and perhaps unexpected act of remembering a phone number.

tā bù zhī zěn me de jué dìng fàng qì zhè gè jī huì.

Somehow, he has decided to give up this opportunity.

This indicates a sudden and possibly inexplicable decision to forfeit a chance or opportunity.

wǒ bù zhī zěn me de gǎn dào le ān wèi.

Somehow, I feel comforted.

The speaker is expressing a sense of unexpected or perhaps inexplicable comfort.

tā men bù zhī zěn me de jiù chéng wéi le hǎo péng yǒu.

Somehow, they became good friends.

This sentence suggests the unexpected or mysterious development of a strong friendship.

bù zhī zěn me de, wǒ jiù xǐ huān shàng le zhè gè chéng shì.

Somehow, I fell in love with this city.

The speaker expresses a sense of inexplicability about falling in love with a city, which might mean it was an unexpected or unpredictable development for them.

bù zhī zěn me de, tā tū rán kāi shǐ xǐ huān chī là de.

Somehow, he suddenly started to like spicy food.

This indicates an unexpected change in the person's taste for food.