这句话语法对不?Only in this way can we live a more healthy and live

Only in this way can we Live in more comfortable and beautif Only in this way can we live happily这句话正确吗?为什么是can we? Only with a healthy and strong body can we live energetic an Only in this way our city can become more beautiful 这句话是对的吗? ——changing the way we live can we save the earth.A Only if B Only in this way can we learn it well.请帮我分析一下这句话 "Only in this way will the earth he a good place to live on. only in this way can we not do 还是 only in this way can't we Only we in this way can we achieve the goal.请问这句话是什么句子结构（这里的 We live in a world where only the strong can survive.是什么从句?w more and more people will live in moden cities a only by changing the way we live can we save the earth的翻译