They pretty much mean the same thing to me. "to be" is often omitted, especially if it sits between a linking verb (e.g., appear) and an adjective (e.g., simple).Originally Posted by ssendur
EX: It appears simple, enough.
EX: It appears to be simple, enough.
"to be" is also a linking verb, so having two linking verbs in one sentence makes "to be" redundant. That's why it's often omitted.
EX: It seems to be cloudy, today.
EX: It seems cloudy, today.
Though, change the adjective to a verbal (e.g., rainy => raining) and "to be" is required:
EX: It seems to be raining.
EX: *It seems raining. (ungrammatical)
All the best.