第一句 know 要加 s
第二句语法上没有问题,就看你想要表达什麼样的语气了.
nowadays "it seems" everyone can speak English 感觉比较委婉
(现在 "貌似" 大家都能说英语)
如果要一种 "是个人就能说英语" 这种语气
可以把 everyone 改成 anyone:(every 和 any 的差别 不只是这个句子适用)
Everyone can speak English = 每个人都会说英语
Anyone can speak English = 谁都会说英语
Any human being can speak English = 哪个人类都会说英语
if you're human,you can speak English 也不错,比较口语.(你要是个人,就能说英语)
补充一点,to speak English 准确来说 是"说英语"
to know English 也是可以的,就是能懂英语