Infinitive phrases contain a verb in infinitive form (not conjugated) along with the word "zu" ⇒ infinitive with zu.
We use infinitive + zu when the verb in the main clause is directly related to the verb in the subordinate clause and the subject of the subordinate clause is obvious.
"Versuchen" is directly related to "treffen." I will "try" to score. Also, it's clear that we are talking about me scoring.
After specific verbs:
You could also express it with a dass-clause:
We can only use infinitive + zu when the subject in the subordinate clause isn't important or it's obvious from the context.
When the subject has to be mentioned, we can‘t use infinitive + zu:
Because there is no subject in an infinitive phrase, it only works when the subject in the infinitive clause is identical to the subject, the accusative object, or the dative object in the main clause.
If I want to express that somebody else will speak perfect German soon, I can not use zu + infinitive. The subject is not the same, and in this case it isn’t obvious either.
Examples with identical accusative or dative objects:
The accusative object is identical to the subject in the subordinate clause:
The dative object is identical to the subject in the subordinate clause:
If the subject of the subordinate clause isn't in the main clause, you cannot use zu + infinitive.
If it is in the main clause and it's clear from the context, you can and SHOULD use zu + infinitive. Infinitive clauses usually sound better because they are shorter and less complicated.
All verbs that have a dass-clause complement:
All verbs that can be followed by a dass-clause:
"Sein" / "finden" + adjective and "haben" + noun:
If the subject in the second half of the sentence is obvious, use infinitive + zu. If not, use a dass-clause.
In this case both are possible, because it's obvious that the subject is the same.
Here you have to use a dass-clause, since the subject is different in the two halves of the sentence.
Almost always true: haben/sein + adjective + infinitive + zu (dass-clause almost never possible) // finden + adjective (dass-clause usually possible)
With separable verbs, the "zu" comes between the prefix and the main part of the verb. It is all written together as one word.
Some verbs require a second verb but DON'T use infinitive + zu. Instead, they use sentence brackets.
Helping verbs "haben," "sein," and "werde"“ also don't use infinitive + zu (because they are used to create other tenses).
Infinitive phrases are subordinate clauses, so the verb goes at the end.
The infinitive phrase must come after the main clause. SC + MC isn't possible.
The infinitive phrase should be separated from the main clause with a comma, but it isn't a must.
There are also some infinitive constructions that also use the infintive form.
A general overview of subordinate clauses.
Everything about temporal clauses can be found in this lesson.