asa isoide dekakeru to, wasuremono wo surukoto ga arimasu.

朝 often works as a time word by itself, so a particle is not always needed.

• 朝出かける = leave in the morning
• 明日行く = go tomorrow
• 毎日勉強する = study every day

You can sometimes see 朝に, but in a sentence like this, 朝 without a particle sounds more natural and straightforward.

急いで is the -て form of 急ぐ (to hurry).

Here, the -て form links actions or describes the manner of the next action:

• 急いで出かける = leave in a hurry / hurry and leave

So it is not a separate full sentence like I hurried. I left. It connects the ideas into one flow.

When と is used to mean when or if, the verb before it is usually in the plain form.

So:

• 出かけると = when (someone) goes out / leaves
• 食べると = when (someone) eats
• 行くと = when (someone) goes

This is a normal grammar pattern. The verb does not need to be past or polite before と.

No. This と is a different use.

Here, と means something like:

• when
• if
• whenever

In this sentence, it connects the situation 朝急いで出かける with the result 忘れ物をすることがあります.

So the structure is:

• A と、B = When/if A happens, B happens

This is not the と used for with someone or for quoting speech.

忘れ物 is a noun meaning something forgotten or something left behind.

So:

• 忘れ物をする literally means to do a forgotten-item
• In natural English, that becomes to leave something behind or to forget something

This is a set expression in Japanese. Even though it sounds unusual if translated word-for-word, it is very common.

You could also express a similar idea in other ways, but 忘れ物をする is a standard phrase learners should know.

This pattern means there are times when... or sometimes...

Breakdown:

• する = do
• こと = turns the verb/action into a noun-like idea
• があります = there is / there are

So:

• 忘れ物をすることがあります = there are times when I leave something behind
• more naturally, I sometimes forget things / leave things behind

This pattern is often used for occasional experiences or habits.

Sometimes yes, but context matters.

There are two very common patterns:

• Verbたことがある = have done before
  • 日本へ行ったことがある = I have been to Japan
• Verbることがある = sometimes do / there are times when...
  • 忘れ物をすることがある = sometimes forget things

In your sentence, it is することがあります, not したことがあります, so it means sometimes happens, not have done before in the experience sense.

Japanese often leaves out the subject when it is clear from context.

This sentence does not explicitly say I, you, or people. Depending on context, it could mean:

• I sometimes forget things when I leave in a hurry in the morning
• You sometimes forget things when you leave in a hurry in the morning
• People sometimes forget things when they rush out in the morning

In many learning materials, it is often understood as I unless another subject is given.

By itself, A と B can sound like a regular result or something that tends to happen when A happens.

But this sentence also includes ことがあります, which softens it and makes it clear that it is not every time.

So the overall meaning is more like:

• When I leave in a hurry in the morning, I sometimes forget things.

Not:

• Every time I leave in a hurry in the morning, I forget something.

Use あります for things, events, and abstract occurrences. Use います for living beings such as people and animals.

Here, こと is an abstract noun meaning an occasion / the fact that..., so:

• ことがあります is correct

It means there are times/occasions when...

It could, but 朝急いで出かけると sounds more natural here.

In Japanese, many common time words often appear without に, especially in everyday sentences:

• 朝
• 今日
• 明日
• 毎日

Using 朝に is not always wrong, but it can sound a little heavier or less natural in a simple sentence like this.