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【分詞構文の基本】
接続詞+主語+動詞(能動態/受動態) → ~ing(現在分詞)/~ed(過去分詞)
(1) When(接続詞) we [were shocked](過去形・受動態) at the scene, we didn't know(過去形) what to say.
→ 〇 Shocked at the scene, we didn't know what to say.
(2) Because(接続詞) I didn't sleep(過去形・否定) well last night. I feel(現在形) so sleepy this morning.
→ 〇 Not having slept(完了形分詞・否定) well last night. I feel so sleepy this morning.
(3) Because(接続詞) they were(過去形) unable to read the map, they got(過去形) lost.
→ 〇 Being unable to read the map, they got lost.
参考にしてください。