Question

there all a lot of things to do ​

Answer 1

Explanation:

I don't think you are going to be happy with the answer since most native speakers are not sure which is "better".

From my point of view: "A lot of things" is plural and therefore it should be "there are a lot of things ..."

But, there are very strong arguments that show that "there is" can be followed by a plural implicit subject, particularly when the subject starts with the singular indefinite article