请问，下面这个句子里算是三个动词直接连用吗？为什么这个可以这样连用呢？动词形式不需要进行什么变化吗

Question

Experts,however, say trying to adapt a worn-out regulation,last used when people worked 6 days a week with no annual paid leave,will be prblematic.

Answer 1

experts say是主谓，宾语是后面的从句。
从句的主语是trying...regulations，是动名词作主语。谓语是will be problematic。中间的last...leave是过去分词作定语，修饰前面的regulation。