正式

Tā yǐjīng zhèngshì chéngwéi wǒmen de duìzhǎng

He has officially become our team leader

This sentence is noting that someone has formally taken on the role of team leader.

Wǒ yǐjīng zhèngshì dìjiāo le cíchéng

I have officially submitted my resignation

This sentence indicates the speaker has formally submitted their resignation.

Wǒ bìxū yào zhèngshì dàoxiè

I must formally express my gratitude

This sentence indicates that the speaker needs to give a formal display of gratitude.

Tāmen zhèngzài ānpái yīgè zhèngshì de huìyì

They are arranging a formal meeting

This sentence is used to describe the type of meeting being organized as one that is formal or official.

Wǒmen bìxū ràng zhège xiéyì zhèngshì shēngxiào

We must make this agreement officially take effect

This sentence suggests that the agreement mentioned should be formally put into action.

Tā zhèngshì xuānbù tā de jǐngxuǎn jìhuà

He officially announced his election plans

This sentence indicates that someone has formally made known their plans to run in an election.

Zhè shì yīgè zhèngshì de yāoqǐng

This is a formal invitation

The term 'formal invitation' emphasizes that this is an official and formal invitation rather than a casual one.

Tā shì wǒ de zhèngshì hézuò huǒbàn

He is my official business partner

This sentence is used to indicate that someone is formally and officially your business partner.

Nǐ xūyào zhèngshì chéngrèn nǐ de cuòwù

You need to officially admit your mistakes

This sentence suggests that the person being addressed needs to formally accept that they have made a mistake.

Zhè shì yīgè zhèngshì de wǎnyàn

This is a formal dinner

This sentence is used to describe the kind of dinner being held as one that requires a certain standard of dress and decorum, hence the use of 'formal' (正式).