Examples of verbless sentences in Chinese
I think 今天星期三 is more usual to be used than 今天刚星期三.

And some people use this kind of structure to concatenate other structure. For example: 我两部电脑, If you want to describe that both of two computers of your own are break. You can say that 我两部电脑都壞了. This example show that 都壞了 concatenate after 我两部电脑.

And sometimes, people do not need to use a verb in sentence, if they just need to use adjective to describe somethings. for example: 這幅畫好漂亮 in English: This picture is so beautiful. There is no verb in 這幅畫好漂亮.