times 是has还是have changed a lot

times 是has还是have changed a lot 是"there has changed a lot"还是"there have changed a lot"?”为什么 是"there has changed a lot"还是"there have changed a lot"? Our country has/have changed a lot so far. ___ has changed a lot .用something还是everthing have changed a lot的被动是have been changed a lot吗 i have changed a lot My life has changed a lot!为什么用has而不用 have People‘s lives at home has changed a lot 里面的lives 是life的复数还是 but a lot has changed since then 是has还是have?A lot of advice has/ have been offered by people? life是可数名词应该写our life还是our lives?Our life have changed a lot