seem doing sth 还是 seem to do sth?RT

seem doing sth 还是 seem to do sth?RT seem to do 还是 seem doing? seem to be doing sth ,seem to do ,seem to have done sth这三者有什么区别, what is the difference between 'seem to do sth' and' seem doing sth'? use sth doing sth还是use sth to do sth after do sth.还是after doing sth. promise doing sth还是to do sth mind doing sth还是 to do sth have somebody do sth 还是doing sth? finish to do sth还是doing sth why not do sth 还是doing sth enough doing sth 还是 to do sth before doing sth还是do sth never doing sth 还是do sth? expect to do sth还是doing sth? important do sth 还是,important doing sth got an invitation to do sth 还是 on doing sth/in doing sth/of doing sth plan+to do sth.还是doing sth.还是 do sth.