3 sentences

1. 最要紧是开心。

   zuì yào​jǐn shì kāi​xīn.

   What's important is that you're happy.

   Source: OpenSubtitles

2. 要紧的是尽快给伤员止血，其他的以后再说。

   yào​jǐn de shì jǐn​kuài gěi shāng​yuán zhǐ​xuè, qí​tā de yǐ​hòu zài shuō.

   The urgent thing is to stop the bleeding for the injured as soon as possible; everything else can wait.

   Source: Dong Chinese Dictionary

3. 这次考试对他未来的发展非常要紧。

   zhè cì kǎo​shì duì tā wèi​lái de fā​zhǎn fēi​cháng yào​jǐn.

   This exam is very important for his future development.

   Source: Dong Chinese Dictionary