Is their a specific way that multilingual speakers differ in their use of translanguaging?

In a recent review report, following a paper I submitted for publication, the reviewer suggested that I should adopt the agency/structure debate as a framework for the analysis of my interviews with Flemish primary and secondary school teachers. 

By now, I'm aware of the basic distinction between structure and agency, and I know the most common views on the topic (focus on structure, focus on agency, or a dialectic relationship between both, like Bourdieu proposes), but when I'm looking for more literature on the topic, there is a vast amount of articles and papers out there - and I don't know where to start. Does anyone have any suggestions? I'm working in the field of (educational) sociolinguistics, and my research is on the language perceptions and (standard) language ideologies of teachers in Flanders (Belgium). 

previous works that have used  questionnaire or interview in their works

In the past almost every speech community cherished and used proverbs in speech acts. Chinua Achebe wrote in Things Fall Apart that in Nigeria, proverb was the oil with which words were eaten. It has been observed over the past five years that the use of proverbs to embellish speech is becoming a thing of the past in Ghanaian speech communities. A preliminary investigation revealed that the generation thinks proverbs reveal the experiencing of the old people in the past and therefore no longer relevant for the contemporary world. Have you noticed a similar downward trend in the use of proverbs in your speech community? If yes, what should account for this trend in your speech community?

Sociolinguistics, linguistics, literature, anthropology

I am seeking information on corpus building:

1. How does big it have to be to be defined as a corpus?

2. What specific methodologies could be used to build a corpus?

3. Examples of empirical studies that report on corpus development?

Links to any online sources would be much appreciated.

for further research.

Hi everyone. I'm actually doing a study on the teaching of sociolinguistic competence. I'd like to know what you think of research on the area of sociolinguistic competence. I noticed that more people focus specifically on speech acts. I understand that speech acts also falls under pragmatic competence. I have an opinion that maybe people prefer to do studies on speech acts (and not other aspects of sociolinguistic competence) because they are more easily measurable and observable. What do you think?

Are there any research studies (in psycholinguistics, sociolinguistics, or language complexity) that provide scientific evidence of an approximate range of words within an L2 sentence that can facilitate processing and comprehension for a learner at a certain level (CEFR)? it's possible that an A1 learner may not be able to process a complex sentence: considering that input comprehensibility depends on various factors, are there any studies that determine a number of words per sentence to facilitate comprehension for each CEFR level?

I want to interview non-native speakers of English, but I am not a native speaker, so to avoid certain implications of this (unnatural setting, accommodation, etc.), I am thinking of sending them the questions and ask them to record themselves. Has anyone done this before? Are any methodological drawbacks I should consider?

Thanks!