给别人发短信让人感觉很不正式。

It's considered pretty informal to text message someone.

youdao

给别人发短信被认为是很不正式的。

It's considered pretty informal to text-message someone.

youdao

所以不要认为你的“谢谢”很笨拙或者很不正式。

So don't think that your "thank you" was clumsy or awkwardly formal.

youdao

There's a lot of Christian churches where you can't get married in the outdoors, that's not an official way to get married.

有许多的基督教教堂,不允许在户外举行婚礼，在户外的婚礼并不代表正式结婚。

普林斯顿公开课 - 人性课程节选

The "is it okay" question pattern is something that you can use to make your speech a little less formal.

is it okay”问句能够让你说的话不过于正式。

Is it okay 课堂 - SpeakingMax英语口语达人

All right, so before I begin I just want to say I want to keep this pretty informal so feel free to jump in if you have comments, questions if you disagree with me.

在我开始之前,我想说,不需要那么正式,如果大家有什么见解或者问,如果大家有什么不同意见,希望大家有一些不同的见解。

麻省理工公开课 - 电影哲学课程节选