SOME  MISTAKES THAT LEARNERS MAKE

Sometimes Learners get confused with derivational and inflection suffixes in using them correctly.

Learners sometimes using the gerunds, verbal nouns suffixes and verbal adjective suffixes incorrectly.

Learner sometimes forgets the personal suffixes on the predicate.

      Learner´s  sentence                              The correct way

Learners sometimes get confused with what suffixes to put in noun compounds.

Learners often forgets or use the wrong case endings ;

can we say

vakit kaybetmesi ..?

It must be ´when I was on my way here´. Otherwise I cannot understand the iken structure.

If I came from the house to the street and saw my friend there could it be

                            Yola gelince arkadaşımı gördüm    ?

It refers a possesive construction. 

Onun  vakit  kaybetmesi ---> His loosing time

We can apply it onto the sentence , but the meaning would be ;

[Onun] vakit  kaybetmesi kötüdür ---> His loosing time is bad.

and it sounds bit odd.

I dont think in this way..not in your exemple..

all I want to say is...loss of time..

in the first I was afraid making a mistake; I have lerned here that, in the case of oynamak it doesnt turn to noun..but as well I remember I saw somewhere the noun kaybolması, so I have thought will be the same for kaybetmek..

and..by the way...

which one is corect:

gülmek istiyorum

or gülmeyi istiyorum..

and what is the difference...

çok çok çok sağol

loss of time is " vakit kaybı ", 

noun kaybolması ---> may be you have seen it in the context as below ;

Bilgisayaramın kaybolmasını istemem. --> I wouldn´t like my pc getting lost.

kayıp = lost..

so..

I cant make a derrivative from kaybetmek...

If we take the same example and refer 3"rd person. Than you might be happy.

Bilgisayarımı kaybetmesini istemiyorum.

I don´t want him to lose my computer.

[literally, I don´t want his losing my computer]

I know I am very stubborn (what can I do, I am researcher..), but when you use one or another..; I saw written both of them; when I ttranslate in my language I cant see the difference but i am sure there is one..or not...

to be or not to be...

kusura bakma...

Being stubborn in learning is a good quality. Bravo sana ! 

One of my old post due to this issue ;

The verb istemek can take either  "infinitive verb" or " verb in accusative form" before it.

Oraya gelmek istiyorum ---> I´d like to come over there. --> Infinitive form

Oraya gelmeyi istiyorum ---> I´d like coming over there. ---> Accusative form

If you like to know the differences between two sentences then look at the "red highlighted" letters. In practice we Turks would use both for the same situation. 

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Türkçe öğrenmek istiyorum ---> I´d like to learn Turkish

Türkçe öğrenmeyi istiyorum ---> I´d like learning Turkish.

In both forms the first verb[al] [öğrenmek and öğrenmeyi ]  can be classified as an object of the main verb [istiyorum]

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However, using the accusative case for the verb before´istemek´ is NOT always sounding good in Turkish , such as ;

Çay içmek istiyorum ---> I´d like to drink tea. ---> This is what we would normally say.

Çay içmeyi istiyorum ---> I´d like drinking tea.--> This form is sounding bit weird.

May be it is like in English, you wouldnt say "I´d like [to] drinking tea" instead you normally would say " I´d like to drink tea"

so.it is about the action in course...

if this action means a movement (somehow, like drink, eat) you use -mek/mak

and

if is about non movement acion (like learning, teaching) you  use accusative form...

what do you mean by non-movement action ?

how can I say....

when you are drinking you take the cup (of tea) from table and bring it to mouth -

but  when you are learning something you dont need to do any movement (the action is only of your brain)

something like this...