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