先看一下英文的解釋：
tend sb 照看
If you tend someone or something,you do what is necessary to keep them in a good condition or to improve their condition
“照看”某人或某事,就是說,你必須盡力保證他/它處于一個狀態(tài)良好或改善他/它的現(xiàn)狀
tend to sb 關(guān)照
If you tend to someone or something,you pay attention to them and deal with their problems and needs.
“關(guān)照”某人或某事,就是說,你對他/它面臨的困難和需要表示關(guān)注.
前者是責任（責無旁貸）,后者是義務(wù)（伸出援手）.