Personlly,I believe it's a big problem. 我認(rèn)為這是個(gè)大問題.
In my opinion,smoking is bad for your health. 依我看，吸煙會(huì)危害你的健康.
I think she is mistaken. 我認(rèn)為她錯(cuò)了.
To be quite frank,nobody's interested in it. 坦白的說，沒人對(duì)此感興趣.
I'd like to point out that we'are in great need of water. 我想指出，我們急需用水.