ぼくの推測では彼はちょっと飲みすぎたのだの英語

• My guess is that he has had one too many.

• ぼく     ぼく 僕 I manservant 卜 divining telling a fortune predicting choosing settling
• 推測     推測 すいそく guess conjecture
• では     では then well so well then 出端 chance of going out opportunity (to succeed)
• はち     はち 蜂 bee 鉢 a bowl a pot a basin a flowerpot a crown a brainpan 八 八つ eight
• ちょ     ちょ 著 work 儲 be profitable
• みす     みす 御簾 a bamboo blind
• すぎ     すぎ 杉 Japanese cedar 過ぎ past after
• だ     だ 拿 arrest capture 兌 exchange 堕 degenerating lapsing into 儺 exorcism
• 推測で     by guess (and by god) / by guesswork
• みすぎ     みすぎ 身過ぎ one's living
• 推測では     at a guess
• ちょっと     ちょっと 一寸 鳥渡 just a minute a short time a while just a little somewhat easily
• 飲みすぎ     → 飲み過ぎ
• 飲みすぎた     I had a drop too much.
• ちょっと飲み過ぎた    He drank a little too much.