Noticed the dark-haired man, not specifically "standing."
Simple Past Tense
Since and "for" require present perfect tense. "Would" should not be used with present tense.
1st action always uses past perfect, 2nd uses simple past.
"Would" with past tense
"will" always with present tense sentence
Past participle instead of simple past
Gerund functioning as a noun, possessive modifies Lionel doesn't hate Adam (him), but "his singing"
Simple past (date in past), not perfect present
Future Perfect: something happening between present and unspecified future time.
Gerund follows the preposition "for," infinitive does not.