having worked side by side with manyenvironmentalists

What i'm here to say is that having worked side by side with manyenvironmentalists, i know that a healthy environment and a stable economy should be possible at the same time.
1题中第一个that引导的是什么从句
2having worked side by side with manyenvironmentalists在句中做什么成分
我想问having worked side by side with manyenvironmentalists是不是做原因状语?

having worked side by side with manyenvironmentalists have been painting和having worked 分别是什么时态？ 2:---It's five years since I worked here. He's having my babe.中文是什么意思这句话 the boy's not having done the assignment 中the boy's not having done为何不用the boy having not done It's 5 years since I worked there.怎么翻译？ --Oh, must you? Stay a bit longer, It's been such fun having you. There's nothing like having someone experience something to help explain it. my mom's having some of our friends over for thanksgiving 谁有tension的she's having my baby 的URL地址‘～急需～～