I agree with [Someone].
我同意 [某人] 的觀點。

例 I agree with Linda, and we do need to take immediate action.
我同意 Linda 的觀點，我們確實需要立即採取行動。

I couldn’t agree with [Someone] more.
我非常認同 [某人]。

例 I couldn’t agree with Linda more when she emphasized the need for better training programs.
Linda 強調需要更有效的訓練計劃，我非常認同。

I (completely) agree with [Someone’s] viewpoint/opinion.
我（完全）贊同 [某人的] 觀點／意見。

例 I completely agree with Linda’s opinion on the importance of preserving natural resources.
我完全同意 Linda 提及保護自然資源重要性的觀點。

I partially agree with [Someone].
我部分同意 [某人] 的觀點。

例 I partially agree with Linda, as I think while expanding business internationally has merits, there are still risks we need to consider.
我部分同意 Linda 的觀點，因為我認為雖然去海外拓展業務有其優點，但仍然存在某些風險是需要考慮的。

I side with [Someone] on this issue.
在這個議題上我支持 [某人]。

例 I side with Linda on this issue, as I also think the government should develop more MRT routes.
在這個議題上我支持 Linda，因為我也認為政府應該開發更多條捷運路線。