He has to move about in a wheel-chair since five years old.
按语法规定，这个句子不太对，由于 since 前面的句子应该用目前完成时，但这个句子的谓语是 has to，它怎么样变为目前完成呢？难道是用 has had to? 像下面如此用？
He has had to move about in a wheel-chair since five years old.
带有 since 从句或短语的主要分句一般要用目前完成时态，不过有例外。夸克说，当主句所表达的是一个习惯性的动作时，就能用通常目前时，甚至目前进行时。
He has to move about in a wheel-chair since five years old. 打5岁起，他就不能不坐着轮椅四处走动。（这里坐轮椅走动事实上表达的是一种生活正常状态，正因这样才用了通常目前时。）
再例：
Since we moved to the countryside we often swim in the river on weekends. 自从搬到乡下以来，大家每逢周末都去河里游水。
至于你改写的句子，就更简单了。由于一般 have to 具备助动词和情态动词的特点，它没目前完成时，具备目前完成时的应该是其后面的实意动词 move。
