1.I feel greatly honored (to be welcomed) into their society

1.I feel greatly honored (to be welcomed) into their society.
为啥不用welcomed?
这个句子你少打一个词it ,I feel it greatly honored to be welcomed into their society.
这句中的it是形式宾语,to be welcomed是真正宾语.所以不用welcomed因为它是过去分词不能作宾语.也可说这是一固定句型 sb feels it +形容词+不定式/从句
2.What will today's talk about
In the lecture ( to follow) ,the professor will tell us something about modern English usage.
为什么不用following,难道是因为"lecture”是在将来?
是的正像你所说的,这个演讲还没做所以用不定式表示将来.
3.( Having been looked for ) for years,life on other planets is still a mystery for human beings.
"life on other planets"是被"look for",为什么不用" Looked for"?
Having been looked for比Looked for更具体表示过去和已经.
4.Micheal put up a picture of Yao Ming to keep himself (reminded) of his own dream.
keep sb.done 是固定搭配?
当宾语是动作的承受者时用此形式.这里sb是宾语done是过去分词做宾补.表示和宾语之间的被动关系.句意是使自己被提醒
5.This is the first time a woman (has been appointed) to the post.
This is the ×× time 后面都加现在完成时
是的,完全正确.如果主句用了is后面从句用现在完成时.如果主句用was从句用过去完成时.