what makes life difficult is that the process of facing and

··这句话应用了主语从句和表语从句：
what makes life difficult 这是主语从句部分（一个句子充当主语）
is 谓语
that 这里作表语从句提示词
the process of facing and solving problems is a painful one 这是表语从句部分（一个句子作表语）
表语从句中 facing and solving problems 是非谓语动词词组（在这里是动名词词组）作of的宾语（动名词【及它的词组】可以当做是名词来使用）构成介宾短语做
the process的后置定语.所以is a painful one做这个表语从句的谓语,而它的主语是
the process

宾语从句 what makes life difficult 是主语
谓语 is
宾语是一个从句： the process of facing and solving problems is a painful one
连接词：that
修饰processis a painful one有什么语法吗？可否改为which is painful?one 指代proce...

句子的意思如下：
面对和解决问题的过程让生活来之不易。
is...后面是宾语从句，其中，facing and solving problems 是 is a painful one 的主语